I don't think the Oberndorf sporting Mausers were rust blued as a general rule, the original one I have isn't. Having said that the original sporter bluing (and the military rifles too) is nothing like modern tank blues. I've lent my copy of Roy Dunlap's book but I think he covers it . . . .
When I had an original rebuilt I did go with a rust blue (Dave Ward did the work) and its very nice (but nothing like the original)
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