Mongolia 1997 Railway Locomotives 600t Monorail Europa the set of 7 imperf progressive proofs comprising the 4 individual colours plus 2, 3 and all 4-colour composites unmounted mint, as SG 2597
Mongolia 1997 Railway Locomotives 600t Monorail Europa the set of 7 imperf progressive proofs comprising the 4 individual colours plus 2, 3 and all 4-colour composites unmounted mint, as SG 2597