Mongolia
| Country: | Mongolia |
| Type: | Postage stamps |
| Series: | Prehistorical Animals (1977) |
| Nominal: | 80 Mongolian möngö |
| Year: | 1977 |
| Size: | 65 x 35 mm |
| Perforation: | line 12½ |
Prehistorical Animals (1977)
 Mongolemys elegans |  Embolotherium ergiliense 0.1$ |  Psittacosaurus mongoliensis 0.11$ |  Entelodon 0.16$ |
 Spirocerus kiakhtensis 0.16$ |  Hipparion |  Aurochs (Bos primigenius) |