Welcome to the forum, Mike. Check out the FAQs for a good start!
It looks like a 1936 S/42 (Mauser's code) that is otherwise matching, so far as the pics show. Condition is a little rough, strawing of small parts pretty much gone.
I'd say if you got yourself a side plate that fit and worked you'd have a dandy shooter!
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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