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RE: Best Bargain in loudspeakers under $20,000?

Eta mechanical movements come in 4 grades: Standard, Elabore, Top and COSC(chronometer).
Differences between grades amount to finish, accuracy,
& higher quality mainsprings, balance wheel and jewels.
COSC certification takes Top movements and subjects them individually to a 2 week multiple orientation, multi-temperature, high accuracy evaluation.
Tissots and Certinas will generally use the standard grade Eta calibers with a few flagship models utilizing Elabore or COSC certified movements. Longines, Rado and Mido only use Elabore and higher grade Eta calibers.


Edits: 03/12/23
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