He is very helpful. My gun has matching serial numbers and everything is as factory records state.
Long-range with 3" chambers all as marked on the firearm.
Started in 1939 and finished and shipped in 1940.
The letter contained a lot of info.
It does not have a vent rib.....apparently I didn't know exactly what that was...but I do now.
The firearm is as shipped from the factory....less some finish over the years.
I would highly recommend the purchase of the research letter.
It is a really cool shotgun that has found a new home.
Once again thanks to all for the help and info.