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There is zero evidence to suggest that one or the other will be called "3861M" in any official Omega documentation. I'm going to suggest it's not the Extranet that is misleading here.
https://www.omegawatches.com/media/pdf/watches/product-sheet/gb/en-gb/31020425001001-en-gb.pdf
https://www.omegawatches.com/media/pdf/watches/product-sheet/gb/en-gb/31060425099001-en-gb.pdf
Bunch of misleading 'bastedzz' now aren't they 😉
There are many threads on the topic of co-axial vs. conventional Omega movements. Here is one:
https://omegaforums.net/threads/co-ax-vs-non-co-ax.43575/
Oooooh, so we finally have a Speedy Professional movement that hacks?
Surely 'msg' = Moonshine Gold? 'O' I would guess designated 'oro' or Sigma. Makes sense to use the shorter term in technical papers, etc.
Oooooh, so we finally have a Speedy Professional movement that hacks?