Finally had a warm sunny day so I hit the Flea Market.
Found an unusual vise that I had to drag home. Made in Poland, stamped PJDb 6",....
No 598. The rear jaw slides on dovetails. Seems well made and has a trademark a U with a backwards F and a P inside.
Couldn't find anything on the internet, It would be nice to know the manufacturer and app date.
Some serious Vise Collectors here so I thought I would give it a try.