Oman 1977 Ships 12b (The Comet of 1812) set of 7 imperf progressive colour proofs comprising the 4 individual colours plus 2, 3 and all 4-colour composites unmounted mint
Oman 1977 Ships 12b (The Comet of 1812) set of 7 imperf progressive colour proofs comprising the 4 individual colours plus 2, 3 and all 4-colour composites unmounted mint