Russia block of 4 types

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Issuer: Russia
Block in sheet 1606
Date: 12/30/1971 (1971 blocks)
(4, 2 x 2)
1, 1: 10k d=amaryllis
1, 2: 10k d=medinilla
2, 1: 10k d=cactus
2, 2: 10k d=orchid