My 300 Xenar is up for sale since I just got a 270mm Rodenstock Rotelar that is a "tele" style of lens and suits my Toyo 45A much better, definitely don't need two lenses 30mm apart.
Lens and shutter are almost new looking and works perfectly. I bought push on caps for it (generic) and they will be included. It is on a Toyo lens board (110X110mm) that is not included unless you want it for $45. I bought both the lens and board from KEH a few weeks ago. This lens will cover 8X10 easily with a 347mm image circle at f22.
Lens Data from Schneider
Lens with caps: $325 Shipped USPS Priority Mail (in US) (paid $325 with no caps or shipping)
Board $45 if bought with lens (65mm hole)