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Auction: 154 - The Philatelic Collector's Series Sale
Lot: 326

#525c, 1c Gray green offset, imperforate between, block of four containing two error pairs, natural straight edge at right as all genuine examples contain, since this error always comes from the two right rows of a left pane, o.g., several h.r.'s, fine and very rare; we have only offered a single mint pair in over 20 years of conducting auctions and it is likely that only ten such pairs were discovered, at least two of which were used; 2013 PSE certificate.

Estimate
$1,500