Great Britain 1941-42 pale scarlet (pale colours, watermark sideways) imprimaturs, SG486a varGreat Britain 1941 42 pale scarlet (pale colours, watermark sideways), SG486a var. A superb fresh unmounted mint, with full original gum, imperforate horizontal pair of imprimaturs with "BPMA" handstamp on reverse. Very scarce King George VI piece from the first approved printing sheet. Exceptional provenance as it was released from the British Postal Museum Archives in 2014. Prior to this it was stored in the museum archives in climate controlled