Stamps of Russia, 1931 airmail imperf issue
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airmail
1931 1931 airmail imperf issue - airships (1931) wmk. Greek border & rosettes
| - | 10k | dkvio | airship over tundra & steppes, imperf | 10.–100 | 10.–100 | |
| - | 15k | graybl | airship over Dneprostroi Dam | 10.–100 | 10.–100 |
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