| 75st Anniversary of belian Socialist Party. |
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Date of issue: 30th of April 1960.
OBC/COB numbers: 1131-1132
Created by: Jean Van Noten / Leon Janssens
Perforation: 11 1/2
Size:
Composition of the sheets: 30
Printing Process: Combined Screen and steeldeepprint
Number of plates: 1-2-3-4
Printing Run: 1131 - 3.821.751ex ; 1132 - 3.284.843ex
Paper:
1131 - 40c - Purple and Red
1132 -3F - Bruin and Red