Stamps of Mongolia, 12.25x12.5 perf
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postage
1971, Mar 1 Mongolian Revolutionary Party 50th issue unwmk p. 12.25x12.5
| - | 30m | multi | ||||
| - | 60m | multi | ||||
| - | 90m | multi | ||||
| - | 1.20t | multi |
1987, Oct 15 helicopters (1987 Mongolia) (7 stamps)
| - | 20m | multi | Mil Mi-12 | |||
| - | 30m | multi | Westland WG-30 | |||
| - | 40m | multi | Bell 206L LongRanger II | |||
| - | 50m | multi | Kawasaki-Hughes 369HS | |||
| - | 60m | multi | Ka-32 | |||
| - | 80m | multi | Mil Mi-17 | |||
| - | 1.20t | multi | Mi-10K |
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