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it is a genuine unused, disturbed o.g., block of four with plate finisher's initials in the upper left margin, a small thin just above the top left stamp and signed by the plate finisher in the left margin.
it is a genuine unused, o.g., never hinged, block of four, with siderographer's initials in the lower left margin the right stamps with a small internal crease.
Apparent Centering: GEM 100 it is a genuine used block of four with siderographer's initials in the lower left margin the lower left stamp with a small thin spot.