Information regarding event cancellation from Event cancellation from PRAHA 83 (*1924)

Postal office:	PRAHA 83 (*1924)
Cancellation color:	BLUE
Text on the stamp (first upper line):	PRAHA 83 ** b
Text on the stamp (second upper line):
Text on the stamp (first lower line):
Text on the stamp (second lower line):	CELOSTÁTNÍ LETECKÁ VÝSTAVA
Text translation:	NATIONAL AVIATION EXHIBITION
Comment:
Offical period of usage:	1937-06-12/1937-06-20

Dates the stamp is used
1937-07-06	Cutting

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