If stainless, it would be a 629. If really a 29, but not blued, it's nickel plated.Truthfully,, all of Clints movies are really cheesy but I like em and they make you wish that “real life” was so easy. But his movies give you some time away.
My Buddy just bought a S&W model 29 (I think) all stainless, really nice gun!
Or a house collapsing due to a large number of bullet holes in "the Gauntlet".My favorite inaccuracy in the Dollar series was the shooting of hats on mainstreet in For A Few Dollars More. Hat eventually falls just out of range so the bullets just drop in front of Lee Van Cleef's feet - because Eastwoods barrel was a couple of inches shorter, while Lee could shoot Eastwoods hat with impunity because he had the longer barrel on his revolver. You have to just love the absurdity in all that. Classic.