| 4th Serie of 'Orval' with print "ORVAL MCMXLI". |
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Date of issue: 5th of October 1941.
OBC/COB numbers: Block 11 and Block 12
see also Block 18 and Block 19
see also Block 20 and Block 21
see also Block 22 and Block 23
see also Block 24 and Block 25
Design by : Henri Dupond
Engraving/Helio
Perforation :111/2
Size:
Composition of the sheets: 1
Printing Process:
Number of plates:
Printing Run: 253.960 sets of each
Block 11
Perforated
567A - 5F+15F - Architecture
Block 12
Non-perforated
567B - 5F+15F - Architecture