Richard, there don't seem to be any f/4.5 Tele-Xenars for large format.
Collin, I'd be very suspicious of the lens. Schneider is a German company, usually (always?) sold Xenars in Compur or Compound shutters, depending on size. Compur smaller, Compound larger. Ain't no Ilex self-cocking shutters that conform fully to the Compur standard or that match non-conforming Compounds. The lens you're offered smells like a remount. If, that is, you remember correctly.
The f/4.5 Xenar is just another f/4.5 Tessar, isn't better than the others. If you want a lens in that class, look around, You should find examples from CZJ, Wollensak, Ilex, and many other makers.