...and saw the other pictures of this watch. Here's my opinion:
1. According to my other research source, at Jules Borel, there was a Ref. 168.(0)008 that contained either cal. 561 or 564, so this aspect could very well be correct.
2. The dial looks refinished to me. If the dial was solid gold there would be an "OM" at the bottom on the C-cases. There were some gold colored dials that weren't gold at all, but these were generally textured. The printing looks a little light to me as well.
3. The crown doesn't look correct, although it very well could be original Omega. Just made for a different watch.
4. Not sure if the hands are correct for this case/dial combination. Most of these with gold dials have very thin black hands.
5. Bezel is probably from another C-case Omega as noted by others.
I think this watch is a frankenwatch at best. The ending auction price was rather high, given the condition issues noted above.
Hope this helps,
gatorcpa
Edit - Not five minutes after posting this, I came across an 18K Ref. 168.029 (day-date) Constellation, with a gold textured dial, original crown and proper bezel. PM me for more details if interested.
This message has been edited by gatorcpa on 2011-12-18 18:06:50