Even though I sell a few razors myself on eBay (I don't have a Fat listed right now) my advice would be to buy one from a fellow B&B member on B/S/T to help ensure a fair price for the exact quality grade that you want to invest in.
LOL Tim. Every time I see that one on the Bay, I just shake my head in disbelief.I know its rare due to the adjustment being located at the bottom instead of the top, but Jeezum!