Stamps, Post Rider on Yak Bos grunniens design
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Mongolia
postage1961, Jun 5 40th Anniversary of Mongolian Postal Service issue unwmk
| - | 10m | multi | Post Rider on Yak Bos grunniens | — | — | |
| - | 20m | multi | Post Rider on Yak Bos grunniens, p. 14.75 |
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