ALL: great stuff today. much better than the usual price talking. i agree that the older vises like Prentiss might also have had the back slides cracked because the users were used to a blacksmith vise or a user of one thinking the new designs could get pounded on. it might have had a weak point in the Prentiss design, but betting all those cracks were from a BFH and user. we have many members of GJ that almost come to blows and name calling if I (we) mention that a vise was designed as a third hand and not something to be pounded on. as i've said when i was a wee lad i would go with my Gramps to the logging equipment repair shops and see a worker putting a 3 or 4 foot piece of pipe on a vise's handle and putting all his weight on it to tighten something in the vise and beat the **** out of it. a bench vise IS NOT a blacksmith vise.
not sure why Columbian isn't in my top 5 or maybe 10 because they are nice vises. i even have passed on some with the old round type handles that are similar to Rock Island and Reeds. maybe Columbian and Wilton are not my favorites because they make cheap vises too unlike Reed, Prentiss, Athol (Starrett), Rock Island.
I'm still learning to speak "METAL" and really like what's been said today. thanks
Isaiah: nice find on the York and it was probably copied by Wilton and made into maybe the most recognized vise in the world then and now. I'm guessing the hole in the back of the vise is for a pin that should hold the vise nut in place sort of like the design for the old Leinen German vices. since i don't own a York (yet) maybe one of the other guys can say.
Bagged: your vise restorations have been great so far so if you think the belt sander can give you something better then good luck with that.