Images courtesy of Superior Galleries

Significant examples:
"MS-60".  Ex - Peter Mougey - William H. Woodin - Tom Elder's sale of September 1919, Lot 21 - Dr. George P. French - B. Max Mehl's fixed price list, 1929, Lot 97, "Proof" - T. James Clarke in 1949 - William Sheldon in April 1972 - R.E. Naftzger in 1992 - Eric Streiner - John Whitney - Stack's "65th Anniversary Sale", October 17-19, 2000, Lot 61, "Sheldon 82", illustrated, not sold.  This coin was plated in "Penny Whimsy" and in the Noyes reference.

Recent appearances:
Very Good-7 (illustrated above).  Ex - Fred Borcherdt, April 1988 - J.R. Frankenfield - Superior Galleries' "J.R. Frankenfield Collection", February 17, 2001, Lot 288, illustrated, sold for $632.50

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