3.k.2.105? Newbie trying to read his new holster

[livingthepast]

Hello all!

Still haven't quite gotten a luger in my hands yet, but did buy a unit marked wwII vet bringback holster in well used condition. It looks from the pictures on ebay to be a wwi reissued dyed black holster. Anyway, the unit marking on the holster is 3.K.2.105. Any help on what unit this was would be greatly appreciated.

Thanks!
Brian