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Is there any practical benefit to non-Swiss lever escapements?
IE natural escapements or coaxial?
There doesn’t seem to be really?
In practice, no. Whatever the theoretical advantages of alternative escapements, modern oils and the Swiss lever escapement have been developed to the point where there is little to be gained—especially when considering the issues of complexity and reliability.
Look at Omega’s co-axial. Are Omegas any more precise or stable than Rolexes? Do they need servicing less often? No and no.
But tourbillions also don’t improve precision. They are actually detrimental.
Remontoirs are finicky and extremely difficult to make. If there is any data on how they actually improve timekeeping, I haven’t seen it.
Like alternative escapements, these things are conceptually exciting but not actually practically advantageous. That doesn’t mean they aren’t neat. Up to you how appealing and worthwhile.
Best way to improve on timekeeping in a basic mechanical movement is first and foremost the free-sprung balance. This has been proven over many decades by Patek and Rolex, though virtually all high-end makers have also adopted it by now.
More recently, makers are switching to dual barrels—not for extending power reserve, but to even-out torque transmission. This has a very real and noticeable impact on rate stability.
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