Will: welcome to the forum and you have a Wilton C0 combination vise with 3.5 inch wide jaws. i'm guessing it's a 1960's vise, but if you unscrew the dynamic jaw all the way out without dropping it and turn it upside down you'll see the date stamp on the keyway maybe with a little cleaning. should have a month and year there like the ones on this thread. also post up on this thread i'm giving you the link for because we are trying to figure out how Wilton date stamps worked.