Breitling is marking its 140th anniversary with three perpetual calendar chronographs that take the legacy of its founders–Leon, Gaston, and Willy Breitling–to the next level. The new caliber B19 is Breitling’s first exclusive perpetual calendar movement, a COSC-certified chronometer.

The B19 is the latest in a long line of watchmaking milestones for Breitling. Leon, who founded the company in 1884, claimed his niche as a chronograph specialist. From his workshop in watchmaking’s epicenter, La Chaux-de-Fonds, Switzerland, he dedicated his life to improving the function, paving the way for his son, Gaston, to launch a game-changing invention in 1915: the first chronograph with an independent pushpiece at 2 o’clock that could start, stop, pause, and reset the timer.

Willy Breitling followed up in 1934 with a second independent pusher at 4 o’clock that separated out the reset-to-zero action, making the chronograph even easier to use. In so doing, he established the form that still represents standard chronograph design today. He went on to enhance his chronos with complications—rattrapantes and full calendars—using movements co-developed with trusted manufacturers.

Breitling has been innovating ever since, opening its cutting-edge Chronometrie in 2001 not far from Leon’s original factory, and releasing its flagship manufacture caliber in 2009. The anniversary B19 perpetual calendar chronographs are the cumulation of 140 years of expertise. The exquisite movement was designed and assembled entirely at the Breitling Chronometrie in La Chaux-de-Fonds—the beating heart of Swiss watchmaking where Leon Breitling established himself more than a century ago.

In tribute, his first factory is immortalized on the movement’s 18 k rose-gold rotor, visible through the open casebacks of Breitling’s three limited-edition anniversary perpetuals—140 pieces in each of the Premier, Navitimer, and Chronomat.