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Inverted Center Stamp Persiphila 532-40PBCI, Scott 562; MNH. 1914 Coronation "Qajar Crown" 3c, perf 11 x 11.5 all PRINTED BOTH SIDES, one side with INVERTED CENTER According to Sellinger, over 200 exist. Some stamps used to require a second or third manual feed through the printing press after changing the ink in the press. When the sheet was accidentally fed upside-down for its second passage through the press, an inverted centre would result.
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