I have this lens for sale here as well for what I paid for it a few weeks ago, I decided to go with a 270mm "tele" style lens instead. Lens is mint, perfect glass and shutter. Comes with generic push on front and rear caps and retaining ring. Lens is in a Copal #3 shutter (65mm lens board hole).
Link to sale ad and photos
I would be willing to trade either straight up or with a little cash from you for any of the lenses below depending on the condition of the lens.
Schneider 210mm f5.6 Symmar-S (worth about $275 in EX condition)
Nikkor-W 210mm f5.6 (worth around $260 in EX condition)
Rodenstock 210mm f5.6 Sironar-N (worth about $200-250 in EX condition)
(Prices are from looking at closed ebay auctions)
I would be open to ideas of other lenses in the 180mm-230mm realm but I already have a 270mm so nothing that high.