The finest example graded by PCGS is a single MS-67.
PCGS MS-66. Ex - Stack's
"William Thomas Michaels", January 21, 2004, Lot 3028,
illustrated, no prior pedigree, sold for $210,000.00
"Walter Breen's Complete Encyclopedia of U.S. and Colonial
Coins" by Walter Breen
The PCGS Population Report,
January 2004" by The Professional Coin Grading Service