New Luger Artillery with holster

[w123]

Hello all. My father in law received this pistol and holster from his father when he returned from WW I. I've attached some pics. I'll try the white box technique if better pics are desired. The numbers do not match on the magazine and stock. Look forward to your impressions. The impression in the holster is hard to read but the date is 1915 and I believe it says J F Gluden and Berlin underneath.