1817 Half Dollar Error List with Pictures
A rare 1817/4 half dollar graded PCGS VF20 sold for $288,000 in August 2024. Its date shows a 7 punched over an earlier 4.
The 1817 half dollar errors below span estimated values of $100–$350,000. The highest prices belong to rare overdates, not ordinary coins with small cracks.
Read on to compare flaws in the metal, repeated edge words, and designs that were struck in the wrong position.
1. 1817 Capped Bust Half Dollar Obverse Lamination Candidate (Estimated Up to $450)
A thin peeling layer on the front could be a mint-made metal flaw called lamination. A seller describes one 1817 half using both damage and lamination, which are different explanations.
A weak layer within the original metal can lift or fall away. A later impact or cutting tool can instead remove sound silver from the finished coin.
The seller’s example remains a candidate until its layer boundary can be checked. No exact location or variety is established.
A rough patch alone proves little. Look at how it meets the surrounding surface.
Estimated Value
An ordinary circulated 1817 with a modest, genuine front-side lamination has an estimated value of $100–$450. A visible attached layer can interest collectors more than an unattractive rough patch.
An 1834 rim clip graded ANACS XF40 sold for $263.25 in February 2026. It is a different early half with a different metal-disc defect.
That comparison helps set a modest range. It does not certify the seller’s 1817 or give it a recorded sale price.
How to Identify
Do not lift a loose flap. Inspect its thin edge with a 10× magnifier and look for a shallow layer separating parallel to the surface.
A gouge often cuts deeply and pushes silver along its sides. Corrosion may leave scattered pits rather than one peeling sheet.
Check the lettered edge of this Philadelphia coin. A scale and calipers can compare it with the original 13.48 grams and roughly 32.5 millimeters; its alloy was about 89.24 percent silver.
Wear also reduces weight. For a quick lamination check, find a thin layer still joining the original surface rather than relying on the seller’s choice of words.
2. 1817 Capped Bust Half Dollar Reported Grease Strike-Through (Estimated Up to $500)
A small area may lack detail while nearby letters or design lines remain clear. A Downey sale record describes this kind of grease strike-through on an 1817 O-107.
Grease or debris can fill recesses in the die, the steel tool that stamps the coin. Metal then cannot enter those recesses to form the usual details.
The record does not say which letters or features are affected. Their location cannot be supplied from another coin.
General softness needs a different check. Ordinary wear or a weak strike can also blur parts of Liberty’s design.
Estimated Value
A circulated example with a clear local interruption has an estimated value of $150–$500. The range concerns moderately to lightly worn coins.
A different 1833 NGC AU55 with central grease streaks on the front sold for $253 in January 2006. That older Heritage result compares the same reported mechanism in another year.
It is not a sale of the 1817 O-107 or an inflation-adjusted price. A faint weak patch generally attracts less interest than a large, distinct interruption.
How to Identify
Compare the weak patch with nearby features of similar height. Wear usually affects exposed high points; an obstruction can leave a local gap in otherwise sharp detail.
Use a 5×–10× magnifier and low light to search for polishing scratches or deliberate smoothing. Compare an ordinary O-107 to avoid mistaking its normal softness for this error.
Inspect the edge lettering and check a scale against 13.48 grams and calipers against roughly 32.5 millimeters. The original alloy was about 89.24 percent silver.
Normal measurements cannot prove grease was present. The quickest useful check is a local transition from missing detail to fully formed neighboring design without scraping marks.
3. 1817 Capped Bust Half Dollar Repeated Edge Lettering (Estimated Up to $1,600)
A second set of words can appear around the edge even when both faces look normally struck. Records include an ordinary 1817 O-105a and an 1817/3 O-101 with inverted repeated lettering.
The blank, or metal disc, received its edge words before the faces were struck. Another pass through the lettering machine could add a second sequence.
Turning the disc over between passes could reverse that sequence. This differs from a second strike of Liberty and the eagle.
The catalog records do not name the overlapping words. Each coin needs its own complete edge examination.
Estimated Value
Readable repeated edge words have an estimated value of $250–$1,000 on circulated ordinary-date coins. Comparable 1817/3 examples may fall around $400–$1,600, with the overdate included in the value.
A cleaned 1834 doubled-edge half graded ANACS Fine Details sold for $220 in July 2026. That later date provides a recent comparison for a worn, impaired coin.
Clear inverted words, better condition, and natural surfaces can support a higher estimate. No sale price is assigned to these two 1817 reports.
How to Identify
Read the edge first, rather than deciding from which way the letters face. Normal edge words can face either direction relative to Liberty.
Use a 10× magnifier and overlapping photographs to follow two separate word sequences. For inverted lettering, turn the picture until the second sequence can be read.
Check the diameter against about 32.5 millimeters with calipers and the original weight against 13.48 grams with a scale. The alloy was about 89.24 percent silver.
A mirror may help view lettering hidden by a holder without opening it. The quickest confirmation is a second readable word continuing through several overlaps, not one repeated stroke.
4. 1817 Capped Bust Half Dollar Flipover Double Strike (Estimated Up to $1,800)
Parts of Liberty and the eagle can share one side when a coin flips over between two strikes. Each face meets the opposite steel stamping tool during the second blow.
The later design may partly erase the earlier one. Surviving pieces from both sides provide the useful clue.
Heritage recorded this error on an 1817 O-103 graded PCGS Fine 12, a worn grade. It did not identify individual surviving letters or feathers in the listing.
The variety is also called Punctuated Date. Its small dot-like date feature is separate from the evidence of flipping between blows.
Estimated Value
The PCGS Fine 12 example sold for $528 on December 23, 2024. Circulated examples with understandable overlapping designs have an estimated value of $450–$1,800.
This relatively accessible sale shows why the visible remnants matter. A higher grade does not automatically make the error more obvious.
Strong pieces of both designs can make a worn coin especially useful to an error collector. The estimate is for the whole coin.
How to Identify
Identify each surviving shape as part of Liberty’s side or the eagle side. A 10× magnifier should help you follow recognizable raised detail, rather than isolated surface marks.
A pressed-in mirror image suggests a different kind of contact. Simple clash marks from the stamping tools hitting each other are usually fainter than separate struck impressions.
Match the O-103 date and inspect the edge lettering. Compare a scale and calipers with 13.48 grams and roughly 32.5 millimeters; the original alloy was about 89.24 percent silver.
For the fastest flipover check, find recognizable raised parts of both face designs on the same side and follow where their impressions overlap.
5. 1817 Capped Bust Half Dollar Reported Missing Edge Lettering (Estimated Up to $2,200)
The edge is reported as plain on an 1817 O-103 in a 2006 Downey sale. Its front and back could look normal if the metal disc missed the edge-lettering step.
The catalog also notes rim bumps. Those describe damage, not the reason the entire inscription is missing.
A local impact does not prove that every edge word was absent from the start. Shallow remaining letters may be hard to see.
The full edge needs inspection. Filing, a blocked view through a holder, or worn letter traces must be ruled out before accepting an originally plain edge.
Estimated Value
A circulated 1817 with an original, completely unlettered edge has an estimated value of $400–$2,200. Rim damage, cleaning, and unattractive surfaces tend to lower its value.
The $220 sale of a cleaned 1834 doubled-edge coin provides only a lower-grade comparison for an edge abnormality. It does not establish equal rarity or value for missing lettering.
The 2006 catalog gives a reported example, not a sale price used here. Confirmation of the entire edge remains essential.
How to Identify
Use a scale and calipers before inspecting the lettering area. The original standards were about 13.48 grams and 32.5 millimeters in an alloy containing roughly 89.24 percent silver.
A reduced diameter or circular file marks can suggest removed edge metal. Normal measurements alone cannot prove the edge is untouched.
With a 10× magnifier, examine the full circumference for shallow letter bases beneath worn or flattened areas. Record each rim bump separately.
Use several angles to see around holder supports without opening the case. The quickest essential check is a continuous view of original-looking edge metal with no surviving inscription or signs of filing.
6. 1817 Capped Bust Half Dollar Off-Center Strike (Estimated Up to $5,000)
Part of the design lies off the metal on an O-105a described in the Logan collection catalog. The 2002 listing calls it about one-eighth off center.
That describes the disc’s position between the stamping tools, not the angle of the eagle. Both faces should reflect the misplaced disc.
An area beyond the tools stays unstruck while some intended design falls outside the available metal. The missing design looks different on each side.
The catalog gives no clock direction. The actual blank area and remaining details must establish that part of the description.
Estimated Value
A circulated 1817 with confirmed displacement around the reported amount has an estimated value of $1,500–$5,000. A readable date and an undamaged blank area help its appeal.
An 1827 Square Base 2 O-128 struck ten percent off center sold for $2,640 in September 2025. That NGC VG8 coin was heavily worn.
It provides a recent same-series comparison with a different date and condition. It supports a range, not an exact price for the Logan example.
How to Identify
Keep the entire physical outline visible in pictures of both sides. A tight crop can make normal border details seem missing.
Compare each design’s center with the same metal perimeter. A misplaced disc affects both faces, while one shifted stamping tool can leave the other side centered.
Use a 10× magnifier to inspect where struck detail meets blank metal. Check the edge lettering, measure around 32.5 millimeters with calipers, and compare a scale reading with 13.48 grams.
The original alloy was about 89.24 percent silver. For a quick distinction from a shifted single tool, find corresponding displacement on both faces beside the unstruck area.
7. 1817 Capped Bust Half Dollar Die Clashes on the 1817/3 (Estimated Up to $35,000)
Faint transferred design marks appear on both sides of the Newman 1817/3, according to its buyer. The coin was graded NGC MS64, an attractive unworn grade.
These clash marks formed when the two steel stamping tools hit each other without a metal disc between them. Later coins could receive traces of the opposite design.
The underlying 3 in the date came from a different operation. It is not a clash mark.
The buyer did not list exact clash locations. The extra shapes must be matched to the coin rather than borrowed from another variety.
Estimated Value
The Newman MS64 sold for $28,200 in November 2013. A similarly desirable unworn 1817/3 has an estimated value of $20,000–$35,000.
Circulated examples with visible clashes may fall around $300–$1,500. The high sale price includes the overdate, preservation, appearance, and collecting history.
It does not isolate a price for clash marks. An ordinary-date worn half with similar faint lines does not receive the Newman coin’s value simply because the marks look alike.
How to Identify
Compare pictures of both sides, looking for a shape copied from one design into the other. The buyer’s published account confirms visible marks without mapping their exact locations.
Use a 10× magnifier and light from several low angles to separate raised detail from dark toning boundaries. Keep the underlying date digit out of this test.
Inspect the edge lettering and compare a scale and calipers with 13.48 grams and about 32.5 millimeters. The original alloy was roughly 89.24 percent silver.
The quickest clash check is a recognizable opposite-side design fragment matching the photographed example, rather than a general ghostlike appearance.
8. 1817 Capped Bust Half Dollar Comet Head Die Defect (Estimated Up to $40,000)
A heavy raised ridge leaves the top of Liberty’s cap and reaches toward the border above star eight. Its shape gives the O-106 family the nickname Comet Head.
The ridge is not part of the intended portrait. It repeats a defect in the steel stamping tool used to make the coin.
Its appearance does not establish exactly how the tool was damaged. A more detailed cause should not be guessed from the nickname.
Some associated examples also lack an upper olive leaf on the back. That separate feature must be checked independently of the cap ridge.
Estimated Value
A PCGS MS66 O-106 sold for $32,900 at Legend in September 2021. Exceptional unworn Comet Head examples have an estimated value of $25,000–$40,000.
Ordinary circulated O-106 coins have a more practical estimated range of $200–$1,000. Wear on the ridge and the rest of the coin affects the comparison.
Check the back variety and surfaces too. The MS66 price belongs to a superb complete coin, not one raised line above the cap.
How to Identify
Find star eight and the top of the cap. With a 5×–10× magnifier, follow the expected ridge toward the border and check that it rises above the surface.
A scratch cuts into the metal, while an attached deposit may show a separate boundary. Change the light and compare an O-106 picture without cleaning the mark.
Inspect the back’s upper olive leaf and the edge lettering separately. Use a scale and calipers against 13.48 grams and about 32.5 millimeters; the original alloy was roughly 89.24 percent silver.
For the quickest Comet Head check, trace the raised cap-to-border ridge above star eight before identifying the back variety.
9. 1817 Capped Bust Half Dollar Die Crack on the 1817/4 (Estimated Up to $350,000)
A fine raised line crosses the front of the Farley 1817/4, from above the cap toward the border beside the date. Silver filled a narrow crack in the steel stamping tool.
The resulting ridge may be hard to see on a worn or toned surface. Light must catch its height rather than just its color.
A scratch in the same general area is not the same feature. The complete path should be compared with the recorded coin.
Reports of back-side cracks on O-106a concern different stamping tools. Their routes cannot be taken from this front-side example.
Estimated Value
A separate PCGS VF20 1817/4 sold for $288,000 in August 2024. Comparable genuine, moderately worn 1817/4 coins have an estimated value of $200,000–$350,000.
The Farley coin itself sold for $132,000 in 2002. These prices mainly reflect the exceptionally rare overdate, including its condition and other features.
A small crack does not create that value on an ordinary 1817. Such coins need their own variety and grade comparison.
How to Identify
Establish the underlying 4 in the date before examining the crack. A line across an ordinary 1817 cannot substitute for the rare overdate.
With a 10× magnifier, sweep low light across the cap and portrait to follow the narrow raised line. Scratches cut below the surface, while toning can change color without creating a ridge.
Check the lettered edge and compare scale and caliper readings with 13.48 grams and roughly 32.5 millimeters. The original alloy was about 89.24 percent silver; the rare date also needs specialist authentication.
Once the overdate is established, quickly trace the continuous raised path from above the cap toward the border beside the date.
10. 1817 Capped Bust Half Dollar Misaligned Obverse Die on the 1817/4 (Estimated Up to $350,000)
Liberty is shifted toward eleven o’clock on the Farley 1817/4, while the eagle remains centered. About a millimeter of blank metal shows below the date.
One steel stamping tool was displaced sideways relative to the other. That is different from an off-center metal disc, which affects both designs.
The widest rim alone cannot tell those causes apart. Both sides must be compared with the coin’s physical outline.
This same rare coin also has a fine crack and a rotated back. Those extra features do not change the evidence for a shifted front-side tool.
Estimated Value
The Farley coin’s estimated value remains $200,000–$350,000 at a comparable worn grade. This is the same whole-coin range used for its crack and rotation.
The separate $288,000 VF20 sale in 2024 helps compare the rare overdate. The shifted front is not another amount to add to the price.
An ordinary 1817 with a demonstrated modest front-side shift would instead be estimated around $200–$800 in moderately to lightly worn condition.
How to Identify
Align photographs by the outside of the coin, not by making Liberty and the eagle look centered. Compare the center of each design with that fixed outline.
The reported Farley arrangement pairs blank metal below the date with a centered back. If both designs shift together, investigate an off-center disc instead.
Use a 10× magnifier to check that the blank area was not created by scraping. Inspect the edge letters and compare scale and caliper readings with 13.48 grams and roughly 32.5 millimeters.
The original alloy was about 89.24 percent silver. The quickest test is a side-by-side comparison showing shifted Liberty but a centered eagle.
11. 1817 Capped Bust Half Dollar Rotated Reverse on the 1817/4 (Estimated Up to $350,000)
The Farley 1817/4 back is reported about 30 degrees counterclockwise from its normal position. The eagle’s tilt measures orientation, not the sideways shift of Liberty on the front.
A stamping tool can turn in its mounting while still keeping the design centered. That leaves the two faces pointing at an unusual angle to each other.
Separately straightened pictures can hide this relationship. A steady flip shows it more clearly.
The Farley catalog account records the angle on the actual coin. A different 1817 must be measured on its own.
Estimated Value
The genuine Farley 1817/4 remains in an estimated $200,000–$350,000 range at comparable worn grades. Thirty degrees of rotation alone does not explain a six-figure price.
Its $132,000 sale in 2002 and the different VF20 coin’s $288,000 sale in 2024 are whole-coin comparisons. Do not add another premium equal to that range.
An ordinary circulated 1817 with a similarly clear moderate rotation might instead fall around $150–$600, depending on condition and surfaces.
How to Identify
Hold Liberty upright and flip the coin straight from top to bottom without twisting it sideways. A normal United States coin should then show an upright back.
Repeat against a fixed vertical line and measure any remaining tilt with a protractor. Do not confuse a design’s sideways position with its angle.
Inspect the lettered edge with a 10× magnifier. A scale and calipers should be compared with 13.48 grams and about 32.5 millimeters; the original alloy contained roughly 89.24 percent silver.
For a quick rotation test, repeat the controlled flip and check that the eagle returns to the same tilted position every time.
Conclusion
Estimated values of $100–$350,000 cover ordinary circulated errors and exceptionally rare 1817/4 coins. The Farley example’s crack, shifted front, and rotated back belong to one coin and one valuation.
For other pieces, inspect the actual feature before applying a range. Read the edge words, follow raised ridges, and compare both designs, keeping wear and damage separate from evidence of how the mint made the coin.