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Issued by:
Mongolia
Function:
airmail
Date:
12/20
/
1977
Issue:
History of Airships and Balloons
Denom:
4t
Color:
multicolored
Design:
Watermark:
unwmk
Perf:
Catalog value:
Prev:
1.20t d=flying crane perf=12
Next:
3/25/1978 20m issue=75th Anniversary of Powered Flight d=A.F. Mozhaiski & Mozhaiski's airplane
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