10-8 with "character"
I've got a 36 no dash just like that. Mine spent about 6 weeks laying on the bottom of the Chesapeake Bay, after a Fish & Game marine arrest turned into a struggle. (not me, a longtime friend) It has no rust, no pitting anywhere. About every month I clean it using engine degreaser, then scrub it in a plastic pan using Dawn detergent and hot water. It gets rinsed well, then goes outside to dry in the sun. When it's good and hot, after about two hours (AZ) I push a little Rem oil into the workings and wipe down the outside carefully with Kroil. I've had it since the mid 80's and took those steps right from the git go. It's always worked very well, shows basically no internal wear, and has never had a speck of rust.
I also have an older Walther PPKS in about the same shape. I've only had it a couple years, and it gets exactly the same devoted care, with equal results.
As already pointed out, a little gun oil works wonders on guns.
And, FWIW I have to agree, leave it alone. Guns are much like old people, the nicks and bruises over the years give character!
I don't have any new model guns of any kind, and it's my opinion that most all makers used to build high quality products that stood the tests of time.
Best regards,
Bob