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postage
1952, Aug 20 8th International Mechanics Congress issue unwmk p. 12.25
| X | 15k | vio | ||||
| X | 20k | bl | ||||
| X | 60k | brn |
1954, Sep 20 47th Conference of International Aeronautical Federation issue
| - | 20k | brnblk | signalling to plane | |||
| - | 35k | dkvio | ||||
| - | 45k | graybl |
1964, May 5 Council of Europe 15th issue
| - | 50k | multi | ||||
| - | 130k | multi |
1966, Oct 18 33rd International Fairs Union Congress issue
| - | 50k+5k | multi | ||||
| - | 60k+5k | multi | ||||
| - | 130k+5k | multi |
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