Values on large petzvals have been very volatile the past year. One like this could go pretty high. Once in a while, one goes low. You can use that fact to try to buy it yourself, tell the seller nothing is certain on OhBoy. I assume all 3 lenses are there, and in good shape, and the focus knob is there. I'd pay up to a couple C notes if he'll take it. If you feel you really need it go a little higher.