Great Britain 1964 20th International Geographical Conference (Ordinary), SG651/4var

Great Britain 1964 20th International Geographical Conference (Ordinary), SG651/4var.

Very fine unmounted mint with full original gum imperforate set of imprimaturs with N.P.M handstamp on reverse.

Very rare with only 10 sets being released by the National Postal Museum in 1984/5.

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