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I have a collection of watches of all types but only ever wear one or two, the day watch is a Lorus quartz lumibrite day/date. No an expensive one, but it stands up to the daily hammering without complaint.
Thanks for the input so far, I will see what a fixed 18000 bph will show on the timegrapher. I will dive further in the ETA 900 beat rate, see if it is consistently mentioned as 18000. I will check the hairspring, no idea how I would check the vibration frequency of the balance (I just started on this watch repairing journey).