Mark,
The markings on the frame and frame parts indicate a WWI Erfurt. The crown/N on the receiver is the German nitro proof instituted in 1910. If it is sideways--"lazy"--it dates between 1910 and about 1914; if it is upright, it is post-WWI. The toggle is Mauser banner commercial dating from the late 30s to 1942; crown/U is the Mauser Oberndorf house commercial proof.
--Dwight
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