Thailand block of 4 types

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Issuer: Thailand
Block in sheet 14040
Date: 8/4/1991 (1991 blocks)
(4, 2 x 2)
1, 1: 2b d=Yok
1, 2: 4b d=Mudmee
2, 1: 6b d=Khit
2, 2: 8b d=Chok