Max,
The "bulge" on the toggle release ramp is a result of repeated impact of the toggle knobs, and indicates that the frame has seen lots of use. It is of no particular concern.
In the photo it is possible to see a Mauser "hump", the slight extension at the top-rear of the frame. This is characteristic of Mauser production from mid-1937 to 1942. Is the left frame panel stamped P.08? If so, it was manufactured 1941-1942; if not, 1937-1940.
--Dwight
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