Significant examples:
"MS-60".  Ex - Superior Galleries "Pre-Long Beach" Elite Coin Auction, May 25-27, 2003, Lot 480, sold for $33,350.00 Found unattributed in Germany on 10/30/83 by Darwin B. Palmer, Jr., 3/15/86- C. Douglas Smith- Dr. Robert A. Schuman. 

Recent appearances:
VF-30.  Ex - Bowers and Merena Galleries' Robert W. Schwan Collection Sale, October 26-27, 2000, Lot 113, "Sheldon-181, Second Hair Style", illustrated, unsold

Net VF-20, sharpness of VF-25.  Ex - Bowers & Merena Galleries' "The Cabinet of Lucien M. LaRiviere, Part II", March 15-17, 2001, Lot 2468, "B-42, 2nd hairstyle" sold for $632.50

Fine-15.  Ex - Bowers and Merena Galleries' Robert W. Schwan Collection Sale, October 26-27, 2000, Lot 114, "Sheldon-181, Second Hair Style", not illustrated @ $276.00  From the 1981 Early American Coppers Convention auction

Net Fine-15.  Ex - Ira & Larry Goldberg Coins & Collectibles, Inc.'s "The California Sale", October 2-3, 2000, Lot 1399, "Sheldon-181, Style 2 hair"

Fine 12, Porous.  Ex - Heritage Numismatic Auctions, Inc.'s "Long Beach Signature Sale", May 31-June 2, 2001, Lot 5369, not illustrated, not sold 

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

Relevant collector organizations:
Early American Coppers Club