Information regarding event cancellation from Event cancellation from PRAHA 1

Postal office:	PRAHA 1
Cancellation color:	BLACK
Text on the stamp (first upper line):	PRAHA **
Text on the stamp (second upper line):
Text on the stamp (first lower line):
Text on the stamp (second lower line):	CONFÉRENCE AÉROPOSTALE 1931
Text translation:	AEROSPACE CONFERENCE 1931
Comment:
Offical period of usage:	1931-06-04/1931-06-20

Dates the stamp is used
1931-06-10	Cutting

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