Stamps of Switzerland, 1929 air issue
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airmail
1929, Jul 1 1929 air issue unwmk p. 11.5
| - | 35 | redbrn & bis & cl | allegory of of air mail | |||
| X | 40c | dlgrn & yelgrn & bl | allegory of of air mail | |||
| X | 2fr | blkbrn & redbrn, gray | bird carrying letter (1930) |
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