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Nice Six! I would shoot it. You can't hurt it, you can clean it up like new and with no box or papers I'm guessing it's already been shot anyway. Enjoy it!

 

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... I wish I could find grips like this for my other sixes. ....

exlogger - would the target grips Ruger is unloading on shopruger.com work for you?

RLG-Security-Six-Grips-Set-of-6-Sturm, Ruger & Co., Inc.

I bought a box of six sets and the price including shipping works out to $9.51 per set. One comment - the wood grain quality varies. I had one really nice set, one that was a close second, a third that was pretty good and the other three were OK but had the color of butterscotch pudding! They fit was good and they feel great.

I think these grips fit guns with serial numbers starting with 151, which cover most Sixes except the first few years.

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I should add - the wood on your Marksman model find is very nice. Not a real dark walnut but very nice grain. I would think they took extra care to put nice stocks on those Sixes.