Found this one in a local pawn shop:
Mauser Kar98, 1915 Erfurt. It seems this one has parts of at least 3 other Mauser's on it. The bolt and bottom magazine cover are each from a different rifle. Rifle butt and barrel are still original.
It needs some work, but the action still works fine. Might take it to a gunsmith and have it checked before I take it to a range.