Dominica 1975-78 Bay Oil Distillery $5 set of 6 imperf progressive colour proofs comprising the 4 basic colours plus blue & yellow and blue, yellow & magenta composites (as SG 506) unmounted mint
Dominica 1975-78 Bay Oil Distillery $5 set of 6 imperf progressive colour proofs comprising the 4 basic colours plus blue & yellow and blue, yellow & magenta composites (as SG 506) unmounted mint