The inscription "15. Deutsches Turnfest Stuttgart 1933" means "15th German Gymnastics Festival 1933".
At the bottom is the "DT" monogram of the Deutsche Turnerschaft [German Gymnastics League].
The tinnie as such is in the shape of the "Turnerkreuz" [Gymnasts' Cross] which is a monogram formed by four Fs for the Turner movement's traditional motto "frisch - fromm - fröhlich - frei" ["fresh - pious - joyful - free"].
The event was held from 21 to 31 July 1933 under the patronage of President von Hindenburg. 600,000 people attended, 120,000 of whom actively participated.
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