I found this vise at an estate sale this month. It had belonged to the deceased's grandfather, so it is at least 100 years old. It is an Oswego, identified by the circle T trademark, and is a Smith's Patent. The jaw width is 4-1/2 inches.
It is missing the pipe jaws, the base plate, and the original mounting stud/wing nut. The jaw inserts have been brazed on, which isn't surprising, given that these vises were often broken. The stationary jaw doesn't appear to have any damage. I put some light oil on the moving parts and it works smoothly. I had to remove the dynamic jaw in order to lift the parts by myself.
The interesting thing is that it has a bell emblem cast into the stationary jaw frame. The emblem is very much like the Bell System logo. Besides that, I can find no markings other than the standard Oswego Circle T, No. 3 Comb. cast-in markings.
I started a new thread in the General Tool Discussion in hopes of finding information from the larger audience.