Monster vintage vise, from the 1950's, maybe early 60's! This thing can really take a beating and I'm sure it has over the years. The Wilton Serrated Machinist Bench Vise http://www.wiltontools.com/us/manufacturing/en/wilton/product.html?node=21392&product=1547128 is designed to handle the most demanding clamping applications. Unlike most vises that have a fixed center nut, the Machinist round channel vise nut is anchored at the rear, which provides straight line pull and even pressure resulting in greater durability. Round channel design also allows for a completely enclosed spindle and nut assembly that keeps debris out and lubrication in for a lifetime of smooth operation. Vise is equipped with high-strength steel replaceable main jaws and a machined anvil work surface.

The vise can also be equipped with a swivel base with dual locking nuts that allows for a full 360° of rotation. Both the locking nuts and base have serrated edges that interact positively to assure a nonslip grip when tightened.

Wilton Bullet Vise Disassembly Guide http://somanyhobbies.wordpress.com/2012/08/28/wilton-bullet-vise-disassembly-guide/ and the follow-up restoration photos http://somanyhobbies.wordpress.com/2014/07/20/wilton-4-vise-resto/

McMaster-Carr Wilton Swivel Base Assembly #8467A586 $175.28 for Wilton No. 450 http://www.mcmaster.com/#catalog/118/2563/=kb9ea0