| Centennial of the Socialist International Party at Londen. |
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Date of issue: 18th of July 1964
OBC/COB numbers: 1290-1292
Created by: Luc Verstraete / herman Verbaere
Perforation: 11 1/2
Size:
Composition of the sheets: 30
Printing Process: Screendeepprint
Number of plates: 1-2-3-4
Printing Run: 1290 - 10.500.000ex ; 1291 - 3.900.000ex ; 1292 - 2.250.000ex
Paper:
1290 - 50c - Allegory
1291 - 1F - Allegory
1292 - 2F - Allegory