Anybody know of a way to date a Stevens 311? It must have been made before 1968 because it has no serial number that we can find. It's got 28" barrels, so it's probably choked Mod/Full. Chambers are 2 3/4" only. The stock appears to be walnut, with no checkering. Double triggers of course. It locks up tight as a tick, and appears to be in very good condition for one of these guns which normally look like they've been rode hard and put up wet. Even the color case hardening on the receiver is still nice. I'm sort of a sucker for double 20's, so it's already on layaway, I was just wondering in anyone knew anything about marks on the watertable or anything like that that might help date it.