I don't think there is any separate mechanism on the back, just a hand with the Snoopy capsule that is on the central chrono shaft, and an earth disc on the seconds sub-dial shaft. Those shafts would have to be a little longer to accept the hand and disc so their part numbers are probably unique, but everything else in the movement should be standard 3861, wouldn't it? People are oohing and ahhing over the back but there is no magic or special automaton mechanism here. It's novel, but many watches have had two faces driven by the same movement, plenty of Reversos have mechanisms on the back side.
As far as availability is concerned, just do a little math. Omega churned out 8,000 pieces of the two Apollo 11 versions with the 3861 movement in about a year. Even if Omega limits this one to only a two year run (and I would bet it will be much longer) they can make at least 16,000 examples, far more than any previous LE. This will not be that hard to score after the initial frenzy is satisfied unless Omega purposely throttles back production, and their revenue. Not likely.
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