Interesting and very abused Rock Island Manufacturing anvil/vise. It looks like there is a quick adjust feature, in that the screw block slides on the same track that the jaw does, that track appears to have been replaced. The anvil portion has seen a lot of use, and it appears someone has broken and welded the jaw to the anvil. It's for sale in Winnipeg here.
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From the drawing, it looks like the anvil end does the big adjustments; the other end makes sense, a bit like a lathe tailstock. D.
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