ブレモンのインスタグラム(bremontwatches) - 12月23日 03時41分

The mainspring in this calibre is 600mm in length and is hand installed into the barrel of the movement. Once wound, a mainspring can give around 40 hours of power to a movement without rewinding. ⠀
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#Bremont #horology #mainspring #watchgeeks #watchmaking #mechanicalwatch #chronometer

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