Images courtesy of Superior Galleries

Significant examples:
"AU-55" (illustrated above).  Superior "Pre-Long Beach Sale", 06/2000:161, where it was described as follows: "1797 S-138 R1 AU55 The obverse is glossy steel brown with lots of golden tan in the protected areas. The reverse is glossy steel brown and chocolate with traces of golden tan in protected areas and four small spots of reddish chocolate toning, largest at ATE and under UN. Just a couple trivial contact marks on both sides. MDS. Graded MS60 net AU50 tied for CC#8 by Noyes, AU55 tied for CC#6 by Bland.
     Ex R. McAusland 9/20/52-Willard C. Blaisdell-Gordon J. Wrubel-World-Wide Coin Investments, Ltd.-American Auction Association 2/74:859-Myles Z. Gerson 6/11/74-C. Douglas Smith-Dr. Robert A. Schuman."

Recent appearances:
AU-50.  Bowers and Merena Galleries' Robert W. Schwan Collection Sale, October 26-27, 2000, Lot 101, "Sheldon-138, Rev. of 1797", $2,185.00

Fine-15.  Heritage Numismatic Auctions, Inc.'s "Philadelphia 2000 Signature Sale", August 6-7, 2000, Lot 5400, "Sheldon-138", $287.50

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