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[Robert]

It does not look official. Freicorps?

 

[keoki7]

Looks like Grenzschutz-Jaeger-Batallion von Hiller or Danziger Grenzschutz Hagelsberg, both Freikorps units.

 

[Robert]

Thanks for the info! I could not find out very much about them, do you have any information about those units?

 

[keoki7]

Led by a Major von Gaertringen, this Freikorps organization was primarily involved in border disputes with the ascendant Polish army along the Danzig Corridor. Later in 1920 I believe they helped to put down the uprising of Polish military units in Upper Silesia.