Oman 1974 Cats 20b (Cream Short-Hair & British Blue) set of 7 imperf progressive colour proofs comprising the 4 individual colours plus 2, 3 and all 4-colour composites unmounted mint
Oman 1974 Cats 20b (Cream Short-Hair & British Blue) set of 7 imperf progressive colour proofs comprising the 4 individual colours plus 2, 3 and all 4-colour composites unmounted mint