Bechuanaland 1904-13 King Edward VII 1s green and carmine, overprint 'SPECIMEN' (type GB23) for Universal Postal Union (UPU) distribution, SG71s.
A fresh specimen example with large part original gum.
A scarce stamp with few specimen examples ever coming on to the market.
"SPECIMEN" examples were used solely by postal administrations for reference purposes to help spot any attempted forgeries.
The Stanley Gibbons catalogue value is £110.
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