Great Britain 1966 Battle of Britain (Phosphor) imprimaturs SG677p var.
A superb unmounted mint, with full original gum, corner marginal "Traffic Light" vertical strip of three imperforate imprimaturs. each stamp with a "BPMA" handstamp on reverse.
A unique 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 vaults since being printed and is therefore in uncirculated mint condition.
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