Patent number is 2430458. This patent was applied for August 27, 1945 and granted November 11, 1947. The Patentee was Leo F. Farrell, South Haven, MI and was called "Automatic Screw Control." Per the source: "This patent number was seen on a Wilton 3½" Triple Duty Vise. The patent covers a quick-release mechanism where the threads engage when turned in one direction but release when turned in the other direction.
Mine is a 5" vise.
Here's a link to the patent details:
http://www.datamp.org/patents/displayPatent.php?id=49758
In the patent detail, the manufacturer is listed as Wilton (Schiller Park, IL), and the "Assignee" is listed as Titan Manufacturing Company (Grand Rapids, MI). What is an "Assignee?" Does this mean the vise was actually made by Titan, or was the patent assigned to Titan for manufacturing other vises, or what? The Patentee is identified with South Haven, MI, which is about 60 miles from Titan Manufacturing's location.
From the little I can find online about this vice, it appears to have been made in the 1950s or possibly into the 1960s.
Just curious but what manufacturing date range is considered 'vintage' here?