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Accompanied with a Royal Philatelic Society (RPS) certificate of authenticity (2004)
confirming the error)
On inspecting the stamps
The Stanley Gibbons catalogue value is £175
A stunning showpiece of this most famous of GB King George V stamp issues
Great Britain 1891 £1 Green SPECIMEN, SG 212s Art Accompanied with a Royal PhilatelicGreat Britain 1891 1 Green SPECIMEN, SG 212s. A superb unmounted mint example with full original gum lettered OB, overprinted "SPECIMEN" type 11. Very rarely seen in fine condition and this is the finest we have ever handled. "SPECIMEN" examples were used solely by postal administrations for reference purposes to help spot any attempted forgeries. The 1 green replaced the 1 brown lilac because of concerns about a photographic forgery of the 1 brown