Images courtesy of Ira and Larry Goldberg Coins & Collectibles

Significant examples:
"AU-58".  H. E. Jones (Edinburgh, Scotland) - Scott & Co. 10/1878:249 - Edward Cogan - Thomas Cleneay - S. H. & H. Chapman 12/1890:1834 -Charles Steigerwalt - unknown - Charles R. Mathewson 1955 - Copley Coin Co. - Lucius S. Ruder, Stack's 9/1987:410 - Herman Halpern, Stack's 3/1988:275 - Julian Leidman - Robert Schick - Heritage 2002 FUN Sale:5356 - Dr. Wallace Lee - Superior 05/2003:559, $8,050.00.  This coin is listed as "MS-60" in Breen.

Recent appearances:
Net VF-30, sharpness of EF-45.  Bowers & Merena 03/2001:2522, $184.00

PCGS graded AU-58 and Del Bland graded EF-45.  J. G. Macallister 5/1945 as "Unc." at $25 - Goldbergs 02/2001:384, $2,990.00 

Del Bland graded VF-35.  Bowers and Merena Galleries F.P.L. 1987-1988; Kingswood Collectors Exchange M.B.S. #1 3/1988:7-52; Bowers and Merena Galleries; Kingswood Collectors Exchange M.B.S. #2 6/88:7524; Austin Ryer; Superior Galleries 1/90:520; Robert E. Matthews (Matthews Money Tree Co.) - Early American Coppers 4/1999:336 - Goldberg Coins & Collectibles, Inc.'s "Benson Collection, Part I", 02/2001:385, $1,150.00 

Del Bland graded Sharpness of VF-30 but tooled in the hair.  J. G. Macallister 6/1944 as "Unc." at $25 - Goldberg Coins & Collectibles, Inc.'s "Benson Collection, Part I", 02/2001:386, $460.00 

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

"Walter Breen's Encyclopedia of Early United States Cents 1793-1814" by Walter Breen

Relevant collector organizations:
Early American Coppers Club