(More pix to come. Photobucket seems to be dead.)
As Paul Harvey used to say "And now, the rest of the story..."
A couple weeks ago, I went to the Joyce Dayton (formerly Joyce Cridland) company website and sent an email telling them what I had and asking if they could tell me when they manufactured vises. An hour and a half later, I get a call from the President of the company who also acts as the company historian. He tells me that when the sales person who got my email walked into his office and told him of my message, his response was "We never made vises." I directed him to this thread and as he read through it, he got noticeably more excited. The oldest sales catalog that they had was from 1910 so the 1888 ad and the patent posted by bl00 were news to him. First he asked if I could send him pictures of the vise, then he offered the company's services to restore it so that some of the folks could actually see it, and finally told me that if I ever want to sell it, I should call him.