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Reverse of above cover with various postmarks:
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Aero-philately is the study of the development of aviation through the medium of philately. |
The first hot air balloon license given to an Indian was to Mr. Vishwa Bandhu Gupta at Livermore,
‘Udan Khatola’, the first hot air balloon built by the Ballooning club of
To celebrate Air Mail Day, a Balloon flight carrying was organised on 16th November, 1973 during the International Philatelic Exhibition (Indipex-73) in