Holy crap, I'm an idiot. I just erased a fairly long reply to Ash. Basically, the Christie's - Omega Museum Neptune was done by a Mrs. Nelly Richard, who was supposed to be the best in the business at this craft. She probably did the Rolex Neptune's as well. These things were commissioned exactly like art which makes sense since they are art. The Rolex Neptune's look like they were done by Mrs. Richard but there are differences from the Omega Neptune she did.
This is fun stuff for people who like to sleuth. I wish I were better at it...
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