You have a 32/20, 32 WCF or Winchester Model Hand Ejector. Someone smarter than himself, or someone with “The Book”, will be along shortly to fill in dates and etc. I have a 5” and a, currently, 6 1/2” barreled version. The were the magnums of the day.
The pearl grips are factory, that means higher grade than aftermarket. They are also fragile so if you intend to shoot it or carry it, consider getting a pair of wood or stag to save the MOP.
See that, lots of folk type faster than I do!
Kevin