Thank you. I thought I had it zeroed to a 5th style 2 screw receiver and floorplate. But I see three screws in the floorplate. And when I use the serial number search at the L.C. Smith serial number link. It won't give me a date if I use the F prefix in my serial number and if I leave the F out, it comes back as built in 1936. Which, I would have thought too early from what I've gathered here about receiver screws and chamber lengths.
I guess I'll go back through and reread everything again.

Thanks to all who've tried to help thusfar.