A 44 Hand Ejector, Third Model, and probably a Wolf & Klar. The serial number on an old inventory card puts it within a couple hundred of the first of the third models to be shipped.
I traded for it in '68, carried it on duty for a while and then traded it for something I wanted more. Back then, it was not a classic or a collectible, just a used gun, but I still wish I had known better.