Check this link: https://www.watchuseek.com/threads/seiko-marine-chronometer-qm-10.4913/ It indicates that the QM-10 used a 4.19MHz crystal.
John ----- Original Message ----- From: "Peter Torry via time-nuts" <[email protected]> To: [email protected] Cc: "Peter Torry" <[email protected]> Sent: Friday, November 26, 2021 9:09:07 AM Subject: [time-nuts] QM10 Quartz chronometer Hello list, I am restoring a Seiko Quartz QM10 Marine Chronometer that is currently inoperative. Preliminary investigations would indicate that the oscillator (TO5 header) isn't functioning therefore I am seeking any information as to its nominal frequency and whether it is just a crystal or an oscillator. I can follow the cmos dividers OK but a schematic diagram would be most useful. Any help or pointers much appreciated. Kind regards Peter UK _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
