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Anonymous Fri Dec 4 23:53:24 2020 No.15764741 [View]
File: 329 KB, 2100x1400, Tissot-Gentleman-Powermatic-80-Two-Tone-Steel-and-Gold-4.jpg [View same] [iqdb] [saucenao] [google]

>>15764729
Some are also marked with a Si symbol which I think indicates a silicon hairspring, which is impressive for the price of watches they appear in. Crystalline silicon (which is the form used for hairsprings) is very hard to machine so more expensive to produce hairsprings out of. I'm pretty sure that these hairsprings are not machined but rather etched using photo-lithography to produce.

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