Kurt, your acquisition with the high serial number may have been sourced from Jäger or Simson but I'm curious if it has the removable screw on the right side of the hingepin? Also are there any additional marks near the lower rib on the underside of the tubes, specifically an encircled GG? I would venture a guess of a manufacture date in Suhl post WWI & pre-1923.

Kind Regards,

Raimey
rse