B&D: 1960 Columbia Scott 716-717, C360-C370 LL corner blocks of 4 MNH-P.O. fresh

Columbia Scott 716-717, C360-C370, mint never hinged. A post office fresh never hinged set of lower left corner blocks. See scans. As shown; as is.
CS 3003
B & D Stamp Corp.
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in some way not represented at the time of sale (e.g. regummed, reperfed,
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