The Silver Hawk was the name that one importer (Galef) wanted their sxs guns from Beretta to be named. That started about 1959 or so.

I think your gun is probably late 1950's and was likely carried here by someone in the military.

If you have questions, post them and I will try to answer. I have quite a few similar Beretta sxs guns. They are great handling guns which seem to hold up well.