China, PRC block of 4 types

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Issuer: China, PRC

Date: 4/25/1959 (1959 blocks)
(4, 2 x 2)
1, 1: 8f
1, 2: 8f d=Bumper crop
2, 1: 8f d=n3.
2, 2: 8f d=n4.