Tom D. gave me info several weeks back on how to find date of mfg. I looked for months until he advised. Get a very good flashlight and look between the magazine tube and barrel where it connects to the receiver. It may have some dirt or crud in the gap , so shoot a little WD 40 through that area and wipe clean. I found my date of 42 ( ref to 1942). Mine is 20" cyl bore nothing to indicate it ever had a bayonet mounted. Will try to get a few photo's for the board to critique.
john in SC
Thanks John... I checked... Can't see anything at all.....