Images courtesy of Superior Galleries

Significant examples:
"EF-45" (illustrated above).  Superior "Pre-Long Beach Sale", 06/2000:166, where it was described as follows: "1797 S-141 R4+ EF45 Perhaps very slightly sharper but there is a short, light scratch in the field at the chin and another under F-AM on the reverse. Otherwise there are only a few trivial ticks here and there. Glossy dark chocolate brown with peeps of frosty lighter brown in protected areas. Sharp very early die state, the fields hard and slightly reflective. CC#2 in both the Noyes and Bland condition census lists.
     Ex William Beaver Chamberlin, Harmer Rooke Numismatists, Ltd., 8/87:8-C. Douglas Smith-Dr. Robert A. Schuman."

Sources and/or recommended reading:
"Penny Whimsy" by Dr. William H. Sheldon

"Walter Breen's Complete Encyclopedia of U.S. and Colonial Coins" by Walter Breen

Relevant collector organizations:
Early American Coppers Club