
Prentiss? From the shape of the jaw inserts.
Rock Island for sure. Prentiss vises have a straight "eyebrow" above the operating handle. Rock islands are curved like the one you have pictured.
Check the Vises thread, i just posted pictures of a Rock Island 574 that is identical to yours.
Yeah I also second the idea of it being a Rock Island vise.
I agree that it looks like Rock Island, but why no name?

That's because (I'd bet) all the Vise makers also made vises without marking for "House brand, companies to sell and may simply used a sticker instead.
I like the new workbench top, almost too pretty to be hammering stuff on. As for the vise, I do not know as much as others, but you got it for free, that is one more vise than I own.
Thanks!
I picked up 3/4 inch plywood. Cut it down. Stained. And polyurethane. If I did it over again, I would have cut it down so that there was a lip all around the edge. Probably would have looked way better that way.
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I'm leaning towards a Prentiss. Catalyst will set us straight when he makes his entrance!
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Whoever said Rock Island wins.
Found the markings of the name on the other side. Looks like the previous owner used the vice to paint things and it was camouflaged.
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