Images courtesy of Superior Galleries

Significant examples:
"VF-35" (illustrated above).  Superior "Pre-Long Beach Sale", 06/2000:190, where it was described as follows: "1800 S-199 R4 VF35 Sharper by 5-10 points but there is a streak of reddish chocolate toning slanting across the reverse from the first T in STATES to the C in AMERICA, and this streak contains a few small spots of very light verdigris, strongest at the base of T in CENT. The only contact marks are a dull, very faint scratch near the dentils opposite the neck, a light rim bruise at the T in UNITED, and a small rim nick at the first S in STATES. Recolored glossy olive brown and steel with splashes of reddish chocolate on the reverse and some frosty tan in protected areas of the obverse. LDS. The reverse die is extensively cracked and swollen and there is a small but strong cud joining the F in OF to the rim. A sharp, attractive cent in spite of the minor defects. Called net VF35 tied for CC#2 by Noyes, net VF30 CC#3 by Bland.
    Ex W.S. Sisson-Henry Chapman 4/12/1916:1007 - Frank Hussey-New Netherlands Coin Co. #54, 4/23/60:1410-C. Douglas Smith 10/60-Dorothy Paschal-Dr. William H. Sheldon 4/19/72-R.E. Naftzger, Jr., 2/23/92-Eric Streiner-1994 EAC Sale, lot 256-Anthony Terranova-Michael Arconti."

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