Dan, the double date indicates use by the Weimar Republic military and the "1920" stamp is actually a property mark that designates Weimar Republic ownership.
I started to mention last night that the slash might mean a post-WW1 unit marking. It seems a common feature of Weimar unit markings. The translation of the markings would, however, likely be the same.
The holster markings are infantry but I'm not certain exactly what they translate to and I don't want to mislead you.
That's a nice rig you have if it's all in good condition.
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