Buy it and shoot it. If you spend much at all to have it re blued it would have to be for your own pleasure as the only way you would ever get your money back is by inflation. $750 dollar refinished 10-6 prices are a ways off. A nice model 10 is about a $500 gun. An as new in box one might bring $750.

I have bought 6 10-6 and 7 frames missing barrels from J&G sales for $159 and $179 and am making them into project guns, 327 federals, a Smolt a fake model 13 pinto ect. One I just fitted a heavy 4" barrel on and called it good. I have blue solution and will eventually blue them. I enjoy tinkering with them. It wouldn't pay to do it for money.