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Easier to buy a good used one from Ebay.

FPU is vise made by the Bison Co. in Poland.

Not entirely correct. I have a 406R with a long nose. The 4 hole answer is more correct.

Now I can answer my own question. The R means it has 4 mounting holes instead of the usual 3. Any R model has 4 mounting holes.

What does the R stand for?

Just bought mine a couple of weeks ago. Paid $50 bucks for it. It did not have the swivel pin.Found one last week for $25 bucks. It is in better shape than the one pictured. Very nice vise. What does the R stand for?