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Although Omega's implementation may be part of the problem, it should be noted that both the 2 level and 3 level co-axial escapement designs were done by Daniels. He developed the 2 level design (which was the more problematic one) due to concerns about the thickness of the movement that some of the manufacturers he was trying to sell this idea to had.
Cheers, Al
Has the thickness problem been solved? Since most master co-axila models Omwgs currently offers are on the thick side. Do these use 2 or 3 level designs?
Does Rolex even use the co-axial system or did they stick with the previous mechanism?

Daniels shopped the co-axial around to many watch companies, including Rolex PP, etc., but Omega was the only one to buy in. I think they saw it as a way of differentiating themselves from the competition, and on that level it appears to have worked.
Most other watch companies use the traditional Swiss lever escapement, but there are some other exotic escapements in use out there - AP has one for example.
Regarding the 2 or 3 level, due to issues with the geometry of the intermediate escape wheel and co-axial wheel teeth causing a build-up of sticky black residue on those teeth, Omega has abandoned the 2 level escapement and no longer makes watches that use it.
This residue would cause the watches to stop, sometimes only after a year or so of use. Although Omega found some ways to mitigate this problem and have a reasonable service interval in most cases, the fundamental geometry issue still persists on these watches. All current production are 3 level escapements, and to me that speaks volumes.
Clearly Omega is not concerned with the growing thickness of their watches, and some of this is due to the movements, but also the case construction plays a big part (transparent case backs).
Cheers, Al
Did they issue an official recall or at least service these beyond their original warranty period?
If it failed in the warranty period, they would service it for free, but if outside the warranty period I don't recall their being any extra servicing done. If it made it through the warranty period, and failed after that, you would pay for the service just like with any other fault.
No recalls...that's not really how the watch world works really...
I presume numbers for a particular model are so small the it’s not the type of thing that makes the press.
Very very very fond of that Zenith Defy. Jesus!