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  1. A

    Sub 18000 bph rates on old pin-lever movements?

    I know this is an old thread, probably no one will read this Anyways, 17.280 bph exists, it is 2.4 Hz. I have a Brac 51 movement with that beat rate and I just learnt of Oris 90P that also used that beat rate - by the way both pin lever.
  2. A

    American PW A more complete list of beats per hour

    17.280 bph, 2.4 Hz, Brac 51 movement in a Héritage pocket watch

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