Struck through foreign material. This example was struck through a thread or hair on the reverse die. Light silver surfaces with considerable lustre.

This date saw the highest production of Capped Bust half dollars for any year of the first United States Mint. The total mintage was 5,873,660 half dollars. Assuming the facility operated six days per week and 12 hours per day, this mintage amounts to 26 coins per minute. This was using the old screw press method and does not allow for any other denominations of coins to be produced. Add production of all other denominations for the year, and the output rises to an average of more than 52 coins per minute.

The half dollar coinage consisted of 20 die varieties from 12 obverse and 14 reverse dies. Among these is one variety considered Rarity-6 and three Rarity-4 marriages. The Logan Collection includes 29 coins representing all 20 varieties.

Leaman/Gunnet Emission Sequence for 1831 Capped Bust half dollars: O-116, 117, 112, 103, (1830 O-108), 118, 119, 120, (1830 O-109), 107, 106, 105, (1829 O-120), 104, 108, 111, 109, 110, 113, 114, 115, 101, 102.