Great Britain 1913 £1 Green "Seahorses", SG403s.
A very fine unmounted mint example with full original gum, printed by Waterlow, overprinted "SPECIMEN" type 26.
A scarce Specimen stamp in pristine unmounted mint condition.
"SPECIMEN" examples were used solely by postal administrations for reference purposes to help spot any attempted forgeries.
GB Specialised Catalogue No: N69(1)t.
