I got a text from the shop telling me my cosmoline is here.
I haven't picked it up yet, but I did look it over to see what I got, and I'm not quite sure what the story is.
The rifle was made in 1936 at S/42 (Mauser Oberndorf). It has the Weimar eagles stamped on it.
The stock is stamped with a SN that matches the receiver, but the stamps on everything else mis-match. The bolt and the bottom metal are electro-penciled with the SN. The rifle has been crudely finished with some kind of black paint / coating. The electro-pencil and the paint scream Russia to me, but there's no X stamp, and the eagle stamps are intact.
There's a couple design features that strike me as odd, also. The front sight has no hood, and there's no cuts in the front sight post to accommodate one. The follower has been profiled to allow the bolt to close on empty, but it didn't really look like it had been ground down.
From what I could see, the bore actually looked pretty damn good, but I'll need to get it cleaned out to see for sure.