Bi-directional winding. I haven’t heard that these later calibers have changed to a ball bearing rotor, so I’ll assume the arrangement is still a rotor post running in two jewelled bearings. This arrangement is much quieter that a ball bearing rotor as with Eta automatic wind movements. The reversers operate noiselessly. If your Breitlings have Eta based movements, they’ll sound like your Omegas. However, if your hearing is sensitive enough to hear an Eta rotor turning on its ball bearing, you have very good hearing. I am unable to hear them.
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