British Levant 1916 "Salonica" 9d agate, type S1 overprint, block of four, SGS7.
A very fine and fresh mint block with large part original gum (the lower pair are unmounted mint).
A very rare multiple as there were only 360 of these stamps printed in total.
Accompanied with a 1971 Royal Philatelic Society (RPS) certificate of authenticity.
SG Catalogue Value: £1,600+.
