Great Britain 1929 1½d Postal Union Congress (P.U.C.) Die Proof, SG436var.
A very fine stamp size example printed in black on glazed card overprinted "CANCELLED" (19.5 x 2.5mm) in red, affixed to piece annotated "I.P.U./C.6./Waterlows".
Provenance: Ex. The personal archive of Royal Mint Engraver H.A. Richardson presented to him upon his retirement.
A unique King George V philatelic piece.
Stanley Gibbons catalogue value: £7,000.
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