Great Britain 1962 3d deep lilac (Wales, White Paper), SGW1var. A superb unmounted original gum left hand marginal horizontal pair of imperforate imprimaturs each with a "BPMA" handstamp on reverse, showing variety "Wing-tail flaww" in position R16/1. A wonderful unique philatelic gem with exceptional provenance being released from the British Postal Museum Archives. GB Specialised catalogue number: XW2a.
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