And maybe not "vintage", but S&W confirmed it's a '64-'65, square butt, sculpted latch, diamond stocks.
But I didn't have to give much money for it, and it's in beautiful condition.
Didn't need another M36, but, dang, who can pass up a deal on a clean, 45 year old pistol?

Apart from a little holster wear on the cylinder, it looks right outta the box!