Stamps of Switzerland, 14 May 1991
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postage
1991, May 14 Europa 1991 issue - space technology unwmk p. 11.5
| X | 50 | multi | Ariane fairing | |||
| X | 90c | multi | Giotto probe |
semipostal
1991, May 14 Pro Patria 1991 issue (no perf info)
| - | 50+20 | multi | by Wolf Barth | |||
| - | 70+30 | multi | by Helmut Federle | |||
| - | 80+40 | multi | by Matthias Bosshart | |||
| - | 90+40c | multi | by Werner Otto Leuenberger |
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