20c Green, "20" on Forehead (13 var).
Vertical pair, top stamp shows the variety, o.g., three large margins, just in at top, tiny surface scuff and slight staining, otherwise Fine example of this rarity -- we know of two vertical pairs containing one variety each, a horizontal pair (both the variety) and two singles, for a total of six examples; all six stamps originated from the same part of the sheet, which received a second lighter impression known as a "kiss print", with 1979 P.F. certificate
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