1794 S-21. Rarity 3. The reverse die was used in the much rarer S-20 die marriage, which used the 1793 head style. The diagnostic is that the reverse letters are very close to the rim. One other reverse die had this feature, but the right ribbon extended all the way to the rim. It does not on this coin. This evidence shows that this is one of the earliest cents made in 1794, and among the earliest cents minted by the US. Say what you will about environmental damage making coins worthless, but the corrosion on this piece is very light, and I like the colors of the patina. It isn’t an ugly coin at all. A lot of the “pits” are just chips in the encrustation and not eaten-away metal.