Iím not saying Iím right as itís been a couple of years since I bought my 8900, but Iím sure the AD told me 10 years. Canít verify it or even remember if itís true. Ignore as necessary. I guess if you take the watch into water regularly the water resistance check will come first.
Watching the Roger Smith lecture on YouTube the other night, he eluded to 10+ years service intervals for his coaxial movement. His discussion was based around the escapement, so I assume Omega will follow at some point, as I believe he feeds back his findings to them regularly. It was a very technical lecture thatís worth a look.
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