Thank you for the write up Spacefruit, unfortunately I couldn't make it to the auction in person so I am interested to hear a first hand report.
If you've handled enough watches, both good and bad, you pick up a good feel of what's right and what isn't and although we collectors can occasionally be over picky there is enough negative feeling on the -1 case to suggest it is not right. I wouldn't have touched it.
I Have a few suspicions about the -2 bezel, possibly of the recent re manufactured batch, although I would need to spend a bit more time on that to confirm.
Having said all that I still don't think people should be frightened by purchasing a 2915. Of course the stakes are higher but we all know what a genuine dial, hands and case should look like for this model, we know the correct serial number ranges, the trickiest part is probably the bezel because we have seen so few for comparison but a posting on this forum should sort that one out fairly quickly anyway. The Omega Sportwatches book has some good examples of genuine bezels to get you started.
The auction results are just further proof that the Speedmaster is the ultimate vintage chronograph!