I have a Stevens single shot break open .410 I inherited from my grandfather. I'm trying to figure out what year it was manufactured, what model it is, and if there are any diagrams/manuals that exist for it.

Printed on one side of the receiver:
J.STEVENS ARMS COMPANY
CHICOPEE FALLS, MASS. U.S.A.
------MADE IN USA----------

Other side:
TRADEMARK
STEVENS
REG. U.S. PAT. OFF & FGN.

There is also a letter "I" inside a circle to the left & above that writing.

Barrel says:
HIGH PRESSURE COMPRESSION STEEL
BARREL AND LUG FORGED IN ONE PIECE

410 BORE OR 12 M-M

On the inside of the receiver, it is stamped
933CW (? serial number)

The barrel measures 26 inches.

Thanks for any input.

pictures:

https://www.dropbox.com/sh/42rdw759m2esx5t/kX1yOsFaI3