Ahhh.....brain fart.

It's a Chicopee, I never went back far enough in the catalogs.

I'd bet yours is a 1954 or 1955 when they first came out and the serial number would be correct. They didn't go to the A series serial numbers till Westfield.

Find me a date code on the gun somewhere, usually it's on the receiver or the barrel by the frame. It's a small oval circle with a number and a letter stamped inside of it. Bet it's an E or an F.