Raimey, I do not oppose your conclusion that the gun left Ferlach in 1925 in un unfinished state and was finalized in Bohemia in the same year (I didn't have time to go into finer points of Czechoslovanian proof rules). The gun in doubtlessly Ferlach made and the place of final finish inside Austria/Bohemia is a minor question here IMO, the major one being the proper explanation of the Simson connection.

With kind regards,
Jani