In 1795, Breguet conceived the “Breget overcoil” spring, today still the reference in terms of balance springs, the choice of the finest watch houses and craft watchmakers. A.-L. Breguet got the idea of altering the balance spring's terminal curve by raising its end and bending it slightly as a way of improving its isochronism. http://en.worldtempus.com/watches/breguet/tradition-fusee-tourbillon-overcoil-7047pt119zu

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