The ten-cent coin is the smallest, thinnest coin we use today.  It is also the first made by the United States Mint, if you count borrowed coin-making machines.  President Washington ordered dimes made before the first Mint building was built.  A coin press was borrowed to make a few dimes in 1792, mostly of copper because of a lack of silver.  The borrowed press was kept in the owner's basement, not on Mint property.