All the casting looks original albeit a little rough in places but there are no signs of modifications. The stationary jaw does not swivel, it is locked in place by some pretty complicated joinery.
Thanks for the tip and thank you all for bringing the picture up. I had intended on using this vise for my general purpose work but maybe I'll use it as a secondary. So you think it's a pattern makers vise? Any idea how old?
I wanted to include pics, but as I am a newby and untrained in the ways of posting, I couldn't figure out how to do it. I have pics on my iPhone which is also my only means to this site, so if you could give instructions I would appreciate it.
I came across this site while researching a tool and decided to join. The collective knowledge seems to be right up my alley and helpful, I hope I might be helpful to others as well.