Union navy uniform buttons, composed probably of brass or copper alloy, with raised upright foul anchor design on horizontal line background and rope border on forward face and backmark inscription that reads "Superfine Standard," with copper alloy attachment clip on back. Images show five buttons in similar condition following removal from the submarine interior sediment, three buttons showing forward face and one button missing backing showing interior following soaking and cleaning, and one button showing forward face and one button with missing backing showing interior following soaking and cleaning.
