GB 1965 SG681pvar Mint Imprimaturs.
Stock Code: P14513801
1965 3d 20th Anniversary of U.N.O. (Phosphor). Superb unmounted o.g. bottom left hand corner marginal "1A., 1B., .1C" cylinder block of four imperforate imprimaturs, each stamp with a "BPMA" handstamp on reverse. Unique.
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