I have a 1916 Erfurt in the "b" suffix range - a police conversion - with original grips and unmarked screws. I also have a .30 caliber rework with all matching numbers except the replacement barrel and the grip screws are not marked. There's no date on the chamber as it was removed but the receiver is notched for the Artillery sight so it's late 1916, 1917 or 1918.
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