Images courtesy of Superior Galleries

Significant examples:
"EF-45" (illustrated above).  Superior "Pre-Long Beach Sale", 06/2000:157, where it was described as follows: "1797 S-134 R4 EF45 Ten points sharper but recolored golden tan and steel brown with delicate overtones of bluish steel, mostly on the obverse. The details are very sharp showing just a touch of light friction on the highest points of the design. There are two tiny voids in the planchet, as minted, left of the hair ribbon, and a spot of very minor roughness at the bottom of the first A in AMERICA. E-MDS, the cracks at E in AMERICA light. An attractive cent in spite of the rather unnatural color, and a good candidate for a proper recoloring. Graded AU50 net VF35 CC#6 by Noyes, net EF45 tied for CC#2 by Bland. The reverse is plated in Penny Whimsy.
     Ex Homer K. Downing-New Netherlands Coin Co. #38 (1952 ANA Sale), lot 1775-Abe Kosoff-R.E. Naftzger, Jr., 2/23/92-Eric Streiner 4/7/92-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