I once puzzled over a gun IDENTICAL to yours in a shop in Idaho. Turns out the owner, for one of those inexplicable reasons, had removed all of the bluing and the gun was in the white. The only clue was tiny traces of bluing near the rear sight. Could it be plain old bare steel?

I agree with the general consensus, though, that somebody wanted a Model 66 (which were hard to find for quite a while) and did the next best thing by refinishing a Model 19.

__________________
“What you got, ain’t new.”