North Korea block of 7 types

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Issuer: North Korea
Block in sheet 19481
Date: 4/1/1978 (1978 blocks)
(8, 4 x 2)
1, 1:
1, 2: 2ch
1, 3: 5ch
1, 4: 10ch
2, 1: 15ch
2, 2: 25ch
2, 3: 40ch
2, 4: 50ch