I have blamed Franz Adamy, possibly incorrectly, for applying the >>F.A.<< as he may have just been a business partner of Albert Adamy. So there are a few other F.A. mechanics with
Franz Amthor leading the pack.
Fritz Albrecht of Albrechts but I think he & his son Rudolf were more into scope mounts & sights.
Franz Anschütz, Fritz Anschütz, both of Suhl and knowing Franz Adamy was the owner of Undo Anschütz, then there may have been sourcing along family lines????
On another note, August Heinrich Ansorg of Z-M & Otto Anschütz of Z-M were both barrel drawers or tube mechanics.
Serbus,
Raimey
rse