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In the case of Tourbillion No. 2 two extra springs lock the going train when the power of the mainspring has been fully spent link but once the mainspring is wound the gear train moves and unlocks the mechanism releasing the balance spring. Surprisingly Klings link didn't patent the mechanism. When the watch was sold directly from Klings in 2016 it came with the technical drawings he made for the mechanism drawings that also link come with this lot from Phillips alongside box and papers of course.
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