| 50th Anniversary of Interparlement Union. |
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Date of issue: 14th of September 1961.
OBC/COB number: 1191-1192
Created by: Jean Van Noten / Jean de Vos
Perforation: 11 1/2
Size:
Composition of the sheets: 30
Printing Process: Combined Steel- and Screendeepprint
Number of plates: 1-2-3-4
Printing Run: 1191 - 5.714.160ex ; 1192 - 1.1990.790ex
Paper:
1191 - 3F - Front of Palace of Nation in Brussel
1192 - 6F - Front of Palace of Nation in Brussel