Modell Nr. 1 if the Greener Crossbolt is absent & Modell Nr. 2 if the longarm wears the Greener Crossbolt. Looks to be one of the very last Modell 1 or Modell 2. Consensus was that the end of WWI saw the last of Modells 1 & 2 but I would put this one between 1919 & early 1923.

Serbus,

Raimey
rse