Raimey,
Nope, nothing beyond what I originally posted. I agree that the 70mm chamber depth was probably done later in the weapon's life, for the American market. I'm just surprised that it's not been shot loose from smokeless shells.
Follow the URL I posted above, there's a link to a page of German proofmarks (1891/1939/postwar).
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Gunsmith,
Thanks, interesting about Schlegelmilch. I'd read where he ran the Arsenal during the Kaiser's time. There was also a Schlegelmilch porcelin factory in Suhl around the same time (and later Tillowitz), something I learned after snagging a tea set so marked for someone's Christmas present.
