If it is a 629-2 then it is a "Mountain Revolver" not a "Mountain Gun". This is the first iteration of the style that would become the Mountain Gun in several calibers about 5 years later.


Why the odd color? I would suspect that for whatever reason a prior owner attempted to put a Nitrate blue on it, which doesn't work real well on stainless steel. While the "blue" should be able to be removed with any of several bluing removers there would still be a finish issue. The Mountain Revolver was finished in a fine glass bead matte which is different than most more recent glass bead finishes. It looks more like what is known as a "Vapor Hone".