This is definatly an Antonio Zoli Silver Snipe. It was bought new in Long Island NY back in the mid to late 60's, do not quite remember when.
When I first got it we took it out, fired a box thru it at hand thrown clays, I recently threw away the rusted up hand launcher
The next box was at a trap range in Miami in the early seventies, knocked down most of them, the gun pointed well.
It has been in a closet ever since. I was hoping to sell it or trade it for a nice running 15-20 hp short shaft outboard