Images courtesy of Superior Galleries 

Significant examples:
"VG-7+ (illustrated above).  Superior "Pre-Long Beach Sale", 06/2000:170, where it was described as follows: "1797 NC-3 R6 VG7+ Choice glossy medium brown and chocolate. The planchet is smooth and corrosion-free. The only marks, and they are not at all distracting, are a few very old, light scratches in the field at the throat and a few others under the hair ribbon. Extremely rare late die state (one other example is reported but I can't trace it) with a very strong crack at TES and weaker cracks through the tops of OF AME. This is the Noyes plate coin for the die state. Called VG8 and CC#2 by Noyes, VG7 tied for CC#3 by Bland. This is the only example with a condition rated better than average, and most are below average. The finest is a porous VG10 locked away in the ANS.
     Ex Michael Kolman (Federal Brand Enterprises, unattributed) 10/73-Chuck Furjanic-Gordon J. Wrubel 11/18/73-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