Here are the vises . The blue 5 1/2" Wilton is marked 4500 and haven't seen one before . Next is a 6" Wilton bullet , next is an unmarked 5 " Made in USA " vise , looking for info on it , next is a 3 3/4" Littco made up in Littlestown Pa .
Looking for any info on the blue Wilton and the 5" unmarked vise .
I did find out the 4500 is a mechanics vise but still don't understand what purpose the rear jaw serves .