unmounted mint Block Larger Than four 6c Dark Blue & Carmine imperforate vertically (C23b), the unique top arrow, double 'Top' and double plate no. block of six (with the registration marker at top left) contained within a top margin block of ten, full original gum which is never hinged, usual natural gum creases (one is a trifle heavy), EXTREMELY FINE, AN EXTRAORDINARILY RARE UNITED STATES AIR POST MAJOR ERROR, UNIQUE AS A PLATE NO. BLOCK, Datz and Scott retail for two error pairs is $20,000.00, the plate no. block is unlisted, Datz states that only five pairs are known
unmounted mint Block Larger Than four 6c Dark Blue & Carmine imperforate vertically (C23b), the unique top arrow, double 'Top' and double plate no. block of six (with the registration marker at top left) contained within a top margin block of ten, full original gum which is never hinged, usual natural gum creases (one is a trifle heavy), EXTREMELY FINE, AN EXTRAORDINARILY RARE UNITED STATES AIR POST MAJOR ERROR, UNIQUE AS A PLATE NO. BLOCK, Datz and Scott retail for two error pairs is $20,000.00, the plate no. block is unlisted, Datz states that only five pairs are known
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