Parmigiani Fleurier launched its Tonda GT collection this summer, with a pair of time-and-date-only models and a complicated piece integrating both a chronograph and an annual calendar. Earlier this week at Watches & Wonders Shanghai, Parmigiani added another member to the family, this one featuring an all-new integrated chronograph caliber, based on the one that powered its award-winning Tonda Chronor Anniversaire model from 2016.

The Tonda Chronor Anniversaire celebrated the 20th anniversary of the watchmaking maison founded by Michel Parmigiani and garnered the 2017 prize for best chronograph watch at the 2017 Grand Prix d’Horlogerie de Genève. That timepiece’s Caliber PF361 was Parmigiani’s first movement equipped with an integrated chronograph function (rather than a module) and it provides the base for the new Caliber PF071 that beats inside the new Tondagraph GT Rose Gold Blue. The COSC-certified automatic caliber also incorporates a large date display and is noteworthy for several technical elements that maximize its built-in stopwatch’s efficiency.
Among these elements are its use of a column wheel instead of a cam, making for smoother operation; a vertical clutch rather than a horizontal one to increase accuracy by enabling the chronograph to start without an initial jolt; the use of a cross-bridge instead of a single attachment to better stabilize the balance; and a high frequency of 36,600 vph (5 Hz), which means the s...