Great Britain 1929 King George V £1 Postal Union Congress (P.U.C.) black. SG438
Great Britain King George V 1929 £1 Postal Union Congress (P.U.C.) black, SG438. A superb unmounted mint block of four. A beautiful and rare philatelic treasure of a stamp considered to be one of the most striking stamp designs ever created. The Stanley Gibbons catalogue price for singles is £1,100.
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