Stamps, graybl&dpbl color
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Switzerland
airmail1923, Mar 1 1923 air issue unwmk p. 11.5
| X | 65c | graybl & dpbl | allegorical figure of flight |
1935 1935 air provisional issue ovpted
| - | 10c on 65c | graybl & dpbl | allegorical figure of flight |
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