Thanks all:

Yeah, there is no name anywhere on the gun. Probably like you said, a cottage gun for beer money. If its as old as 1899-1924 I would be surprised because if so, it's in the best condition for even 1925 of any used gun I've ever seen. It's also got 2 3/4" chambers which I realize may have been added, but still.
The bores are mirror, there is only one very small minor rust pit that doesnt appear very old on the bbl exterior. In fact, I rubbed most of it off already with some 0000 steel wool and break free. That said, should I limit load pressures in this gun?
Doesnt the PV indicate its fine for modern powder? What do those choke numbers translate into as far as cyl/Imp Cyl/Mod/Full etc?
What does the D=70/20.6 mean? Thanks. I will try and get netter resolution pic's of bbl flats.