Check out this shotgun I just scored!

That is a pretty early one, pre-WW2 by the 94xxx serial number and all the acceptance stamps. Be careful operating that safety inside the trigger guard. There's a reason they moved it to a cross button behind the trigger.
Auto-5 Semi-Automatic Shotgun
There is a ton of information out there and a couple companies around St. Louis with ex-employees that restore them. But like a Mopar, that restoration ain't cheap.

One of the ones I have is serial number 1,***, so first or second year. Unfortunately it is thrashed, but I'll restore it one of these days.