Now there weren't any Ferlach Maker Codes just yet as the 2nd Major Disagreement hadn't started nor ended. The Brit's issued Maker Codes on some basis & I had been told it was House Numbers, but that may or may not be the origin.
I don't think the Austrian's had a proof rules change but the Bohemians had or were in the process. The Austrian's didn't have bona fide German oversight until the Sudetenland was annexed in 1938. The Borovlje Mechanics of Kärnten had a long history of proof and held to that until the Germans commandeered the Sudetenland to >>Help them Supervise their Affairs<<. Austrians and German mechanics had different measuring techniques.
Just like the Hammer Jones Underlever Platform w/ flash deflectors, and most times a metal buttplate to bludgeon quarry, the Austrian held tight to their roots and didn't embrace change or new fangled ideas quickly. So, 65mm as the norm for the most part until the end of the British Period(1945 - Okotber 25th, 1955) and orders were pouring in for 1953 or before.
Hochachtungsvoll,
Raimey
rse
