. . . $2K would represent the top of the market. It's not a terribly collectible reference, so the eBay crowd would likely top out at $1K. Between collectors, I can see $1.2 - $1.5K.
When an item like this goes over the top, it's most likely by a person new to collecting that really wants a pristine example in the worst possible way. For the same money (~$2K), a pink gold ref 2521 just changed hands on eBay. That's a rare jumbo reference, and a chronometer to boot. Much better to put marginal dollars into that than the black waffle. It'll be a while before the winner of this auction is in the black - no pun intended!
Art