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  • Arnold & Son

    Constant Force Tourbillon

    Reference# 1FCAR.B01A.C112C
    Manufacturer's retail price: $197,500.00
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    • Details
    • Description
    • Limited Edition: 28 pieces
    • Case: 18-karat rose gold
    • Size: 46mm
    • Movement: hand-wound manufacture caliber A&S5119
    • Function: tourbillon
    • Power Reserve: approximately 90 hours
    • Water Resistance: 30m
    • Dial: openworked
    • Caseback: sapphire crystal
    • Strap/Bracelet: hand-stitched alligator

    The symmetrical movement architecture of the Constant Force Tourbillon movement pays tribute to Arnold & Sons' historic marine chronometers. At the top, two visible mainspring barrels and the constant force device provide optimal power to the tourbillon at the bottom of the dial.

    To maximize power consistency in the Constant Force Tourbillon, Arnold & Son began with the mainspring barrel, the source of the movement's power. Instead of using just one mainspring barrel, which would produce significantly different amounts of torque between fully wound and nearly empty, the Constant Force Tourbillon has two symmetrical barrels in series, visible dial side at 10:30 and 1:30. The first mainspring barrel alone powers the gear train, while the second barrel tops up the first whenever its torque output drops below optimal. This ensures that the power to the regulator flows as constantly as possible.

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