I think the 2915's sold on 15 December 2015 need their own thread. The Chisties sale room was about half full of seats, with all the seats occupied. There were about a dozen or so christies staff on the raised desks at the side taking phone bids. Lot one (the case openers) opened slowly but gathered momentum and sold well as did the hippocampus. (Not something I would enjoy owning ). Both for substantially more than I have seen these items sell for elsewhere. The 2915's came next. The 2915-1 was dispatched for 110,000. When these rare watches sell, it is the figures of $50,000 to $100,000 that is spoken of. Christies have held this up as an original case, in spectacular condition. There was a considerable swell of thought circulating about this watch' case. It had the exterior thickness, polish and finish of a NOS case, but underneath there was corrosion at the case join. The case back was not sharp like the case band, and did not match in finish. There was something smelly about this. If this had been genuinely accepted by the community as NOS I would expect this watch to have breached $200,000. However I inspected this watch. Here is what I saw. The case was thick, well defined and perfectly brushed. I have never seen one like it. My first impression was it reminded me of the refinished Rolex cases out of Asia. Opening the back there is corrosion on the gasket sealing edges, and on the case back. If this case was so unused, why does the case show so much corrosion? Any corrosion at all, would not fit with the perfect exterior. And the exterior, is perfect. On inspecting the top of the case, I saw a machine mark like a knife cut on the shoulder near the bezel on one lug. This is a very hard place to get into and possibly a machinist error. I have never seen anything like it on a straight lug case. On the case, up near the bezel join, the case showed micro holes. This is sometimes seen in laser welding. I don't know enough about it all, but I don't like to see those holes, nor the additional corrosion at the bezel junction. The dial, bezel and hands all matched in terms of age and patina. Each other, that is, not the case. The 2915-2 was bid sharply to 65,000 and then hung for a while as Christies tried to get a phone bid. Eventually sold for 95,000. If you compare the two 2915's you can see the market liked the -2 better than the -1. This was a far more honest watch. I think this was the deal of the day. I spent a long time holding these two watches in hand, and the -1 did not grow on me like I expected it to. The more I looked at them, the more I liked the -2. In my experience, fine object grow on me, and less objects lose their initial attraction. I am not sure who bought the -1. I don't think it was the museum, the buyer sat in the front of the room and the winner of the 2915-1 was at the back. I could be wrong, or the museum could have had another bidder in the room. I am interested to hear what others think.