I couldn't find anything on Ben Franklin's weight in any of his biographies.
However,
at 12.2 stone: 12.2 X 14 pounds /stone = 170.8 pounds = 77. 54 kilograms, seems to be quite plausible.
Nevertheless,
this coin, at weight 12.2 grams, is light for a 1951 silver Half Dollar, by three tenths of a gram.
It appears that this coin may have been attacked by nitric acid, which would leave the surface clean, because nitrate salts are water soluble.
However,
at 12.2 stone: 12.2 X 14 pounds /stone = 170.8 pounds = 77. 54 kilograms, seems to be quite plausible.
Nevertheless,
this coin, at weight 12.2 grams, is light for a 1951 silver Half Dollar, by three tenths of a gram.
It appears that this coin may have been attacked by nitric acid, which would leave the surface clean, because nitrate salts are water soluble.























