Wells, Fargo & Co., Pony Express, $4.00 Black (143L5).
Vertical block of six with huge bottom left corner sheet margin, unused (no gum), large margins top and right, detailed impression on bright white paper
EXTREMELY FINE. A GORGEOUS BLOCK OF SIX OF THE $4.00 BLACK PONY EXPRESS ISSUE.
Blocks of four are listed but unpriced in Scott. With 1997 P.F. certificate
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