| International Philatelic exhibition at Brussel. |
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Date of issue: 26th of May 1921.
OBC/COB numbers: 187
Design by : Georges Montenez
Engraving : John Enschede & Zonen , Haarlem
Perforation : 11 1/2
Size:
Composition of the sheets: 1 panels of 25 (5x5)
Printing Process: Boekprint
Number of plates: I
Printing Run: 10.000 sheets of 25 stamps
Paper: machine Paper
Watermark : None
187 - 50c - Dark Blue