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A comment on Open source mechanical Swiss watch movement. Parent comment

Re:Open source mechanical Swiss watch movement by TheManInThePub on Thursday May 13, 2021 @07:13AM (#27140804)
Loosing 4 seconds per day (28 per week) falls within the bounds of accuracy required of a Swiss certified mechanical chronometer and is pretty good.

https://en.wikipedia.org/wiki/COSC

[I made a similar comment further down.]

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