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I think the stamp shows a yak, although it has got no horns. A female perhaps?
These stamps show the Tian Shan mountain ranges.
From left to right, from top to bottom:
1. Ak-Say Glacier
2. Kotur Glacier
3. Semenovsky Glavier at Khan Tengri mountain
4. Zvezdochka Glacier at Jengish Chokusu mountain
5. North Inyltschek Glacier
6. South Inyltschek Glacier, both also at Khan Tengri mountain