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Hey NICK , UH.....probably / maybe ? Worthwhile that is.
I'd suspect it is a No.574 , it has the base swivel? and no no pipe jaws . The ROCK Island brand hasn't seemed to have been MORPHED by a Counterfeit producer or similar.
It could be a ,uh ...... "Factory 2nd" from the now OLD DAYS ?
Many manufacturers did this with production line FLAWS or even the rare "Warranty Returns" .
Sold as legitimate but with ZERO Warranties of any kind.
Often all other specific indicators were also removed , like the MODEL NUMBERS !?!
These vises generally had indicators in the base and mobile jaw.
The pic also shows a couple things. There are 4 tiny "PECKS" in the back of the base. Looks like where the - "later model tag" would have been held in place ,with 2 or 4? hammer rivets.?
The - Birtman Electric Company - tag would have been there unless it was a "2nd" (probably) .
They were the actual? firm & manufacturer from like 1930 to 1957-ish ?? ?
A point of caution .? I find rather incredibly these things were not infrequently BROKEN !!!!!!!!?
Often the front jaw breaks off where it attaches / meets? the driven sliding beam.?
The swivel locking handle has been replaced with a now bent bolt , not uncommon of course,but......
Depending on manufacturer and model of course , there is most often a castellated or TOOTHED plate or jaw that locates the swivel more firmly in place without having to TIGHTEN that clamp to the point BENDING the handle .?
So caveat emptor ! :^)
It could be a good acquisition at that price. But DO study just what you are looking at.? Hopefully it is a good find !
I have several vintage Wiltons , but I believe my favorite is a peculiar "Backwards Vise" . Ironically and almost dreadfully it was indeed made in POLAND.? An - FPU Vise - sometimes called a BISON.? I inherited it from my father-in- law?over 20 years ago. The FRONT JAW is fixed. The Rear Jaw opens with comparatively very wide WAYS to support the loads.

Just sharing a - potential - point to look for. I don't know specifically which system they used,but THESE were laying on a work bench of mine and they are related.? These were from another 1975 era vise i have that needed cleaning up. Just something else to look at on the underside to see what is there to lock the swivel properly as intended. The JAWS of that viselook pretty good at a glance at least . Do look at that seam for a weld. It could be just fine regardless !
Hope it works out !?