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Hi Graham

That ticking away must be like music in your ears... smile

I believe the fastest I have is 28800 A/h or 4Hz on several watches.
But would actually love a Zenith El Primero calibre.

Plus
must be precision and on a chronograph the resolution.

minus
must be more wear and maybe less 'reserve de marche'

Best regards
Hans

P.S. would be interesting with a post on the topic..maybe from Ginger..

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