I have this EXACT vise, same 111066/111067 casting numbers, the original label is a little easier to read on mine, but it has no model number, only "Mechanics Vise". Mine had mismatched jaws someone had tried to butcher onto it. In the early 90's a call to McMaster-Carr describing it as a 5" Wilton Mechanics Vise got me new Wilton jaws in a matter of days (McMaster is unbeatable). I think the price was around $40. The jaws were (are) fantastic - beautifully machined, very sharp points, and very hard. Twenty years later there isn't a mark on them. Even came with new mounting screws.
Might be worth trying McMaster now - they list repair parts for other styles of Wilton vises.
When you get a model number would you post it? I'd really like to know. Thanks.