Thanks to Posters 2 and 3. I presumed stainless, not knowing that that nickel was an option. The pitting resembles severe facial acne scarring. I had not thought about solvent damage to a nickel finish. And, as admitted, I know nothing about how the frame metal is machined -- hence my uninformed suggestion.

At this point I will let it sit a while while I finance other projects. The revolver has already sat on the shelf for months. If my interest revives, then the "it has been here for months" line becomes part of the haggling.......