Images courtesy of Gene Braig

Significant examples:
(illustrated above).  Ex - Bowers and Merena "Norweb", October 1987, lot 78 - Gene Braig

VERIFY - "AU-50".  Ex - Superior Galleries "Pre-Long Beach" Elite Coin Auction, May 25-27, 2003, Lot 300, sold for $6,900.00 Ex Federal Brand Enterprises 1/63:3623-Milton G. Cohen-Natalie Halpern 1981:3- Wayne Babbitt-Natalie Halpern 1/85-Wes Rasmussen, McCawley & Grellman Auctions 1/11/97:189-Dr. Wallace Lee. 

Notes:
The finest Proof "Original" Brown example graded by PCGS is a single PR-65BN.

Sources and/or recommended reading:
"The PCGS Population Report, July 2001" by The Professional Coin Grading Service

Relevant collector organizations:
Early American Coppers Club