Sorry OP, you have a modded Model 64. Period.
The frame is the fixed-sight version.
The sight is longer than the channel that was cut for it - a sloppy error. The sight should have been cut at the end of the milling in order to at least resemble a real S&W adjustable-sight gun.
As was previously noted, that is not a "normal" S&W front sight.
The Model 65, just like the 64, is a fixed-sight gun.
Your posts make it sound like you dearly want to have some sort of unicorn, but alas, it is not to be.
I've personally had adjustable sights put on fixed-sight guns. It's a simple mill job of the top strap followed by a cut across the back for the adjusting portion. $100 at most gunsmiths.
Incidentally, I don't know a thing about 64-1s that were made for .357 Magnum. Maybe, maybe not. One thing though, would be that the years the 64-1 was produced, Magnum cylinders were recessed. Is this gun?