Mine's the 3.5"--US Made. Was Great-Granddad's when new, spent many years in a 55 gal drum of scrap metal and junk tools in the basement (of which all three "tools" are now in heavy use--a Williams 1 1/4" Spud wrench, P&C-rebrand True Temper carpenter's axe, and the vise)
One jaw pad is worn down, the other missing (with reamed holes where it once went--so I'm confused on how to fix it), but it's in use now as my hobby vise. For what I do, the lid to a foam cooler is all it needs to be used--plus it helps to wrangle small parts. Most of the stuff I do on it is so light duty, I have no need to mount it. I most often just clamp a pair of plastic hemostats in the jaws to use it as a helping hand-type tool.
I fixed my old glasses a couple weeks back with it.
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As I've understood on other forums, Columbian was bought by Wilton, and became a budget brand as opposed to a company.