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GREAT BRITAIN - OXFORD UNION SOCIETY SECURITY OVERPRINTS 1863 (Nov 23rd) Oxford Union Society envelope to Birmingham, embossed on flap by Speirs & Co, this covered by entire Oxford Union wax seal, bearing 1d penny red (C10) bearing Oxford Union Society 'O.U.S.' reading upright in red, tied by a fine 603 Oxford Duplex with Birmingham same day arrival cds (23/11/62) to reverse. Lovely! (1 covers)