Stroma 1971 Cats 15p on 5s (orange-eyed white) imperf m/sheet overprinted 'Emergency Strike Post, International Mail' with Stroma obliterated, unmounted mint
Stroma 1971 Cats 15p on 5s (orange-eyed white) imperf m/sheet overprinted 'Emergency Strike Post, International Mail' with Stroma obliterated, unmounted mint