Seems we go through this regularly. GS can be Gerardi SPA or Gerardi Sowa. Apparently Sowa and Gerardi have a relationship. Either way it is a fine vise.
That one comes with the table clamps and I see a bit of the vise stop hiding behind the top right corner.
I LOVE MY GERARDI!
But that one is in rough shape. The seller has an attitude too. Used stuff isn't worth 50% of the new cost unless it's never been used. I'd put the value of that vise closer to 3 or 4 hundred as is. On the other hand, if it works properly and the gauge surfaces are not all Fkd up, those prismatic jaws are solid gold.