Stamps of Switzerland, 1 Mar 1923
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1923, Mar 1 1923 air issue unwmk p. 11.5 (6 stamps)
| X | 15 | brnred & apgrn | airplane | |||
| X | 25 | dkbl & bl | airplane | |||
| - | 35 | brn & buff | pilot at controls | |||
| - | 40c | gray & grayvio | pilot at controls | |||
| X | 45 | red & ind | biplane | |||
| X | 50 | blk & red | biplane |
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