1910 Half Dollar Error List with Pictures

First check below the S on the back. A small extra curve there may be part of an earlier mintmark, the feature listed for this 1910 variety.

A normal 1910-S half dollar sold for $186 at Heritage in October 2025. That gives a starting comparison for the coin’s condition.

This guide to 1910 half dollar errors uses an estimated $100–$400 range for confirmed worn S/S examples. Here is how to tell the extra letter from a rough or damaged edge.

1910-S Barber Half Dollar Repunched Mintmark Error (Estimated Up to $400)

The name S/S south means an extra S appears below the main S. Both marks began in the die, the steel tool used to stamp the coin.

A worker punched the mintmark twice in slightly different positions. Parts of the earlier letter remained and could appear on every coin struck with that tool.

The Barber Coin Collectors’ Society lists this 1910-S variety. No survey respondent reported owning one.

That survey count does not tell us how many survive. The feature to look for remains a separate S outline below the main letter.

Estimated Value

Confirmed examples in Very Fine to Extremely Fine condition have an estimated value of $100–$400. Those grades describe worn coins with much of their design still visible.

A regular PCGS VF30 1910-S sold for $186 in October 2025. A different-year 1942-D/D half dollar brought $69 in March 2024.

Neither was a 1910-S/S sale. They provide comparisons for the date and for a repeated mintmark, while clear extra detail helps a confirmed example.

How to Identify

Find HALF DOLLAR on the back and the small S below the eagle’s tail. Photos of a 1910-S cent will not identify this half-dollar variety.

Inspect the bottom of the S with a 10× magnifier. Look for a curve that fits another S, rather than a lump or a flat shelf beside the letter.

Move the light across the surface. Roughness from corrosion can make the letter look thicker without creating the earlier outline.

Keep full photos of both sides for comparison. A loose unworn half dollar should weigh about 12.50 grams and measure 30.6 millimeters, with edge grooves; a scale and calipers can check this.

The quickest reliable confirmation is a specialist’s match to a documented 1910-S/S half dollar.

 

Conclusion

The extra S belongs below the main mintmark. A survey listed the variety but received no reports of owned examples, so that count cannot tell you its total rarity.

The estimated $100–$400 range is for confirmed worn examples with useful detail remaining. Match the letter’s shape first, then compare condition; a rough S alone does not establish the variety or its value.