The presentation of the fourth-generation Type XX, to be unveiled in June 2023, is accompanied by a mechanical feat embodied by the caliber 728. This powerful self-winding flyback chronograph movement, set to a high frequency of 5hz (36,000 vibrations per hour), which took around four years to develop exclusively for this Breguet collection, is assembled using 350 components.
It powers the Type XX Chronographe 2067 model, the so-called “civilian” version that takes up the technical codes defined by the French naval aeronautics industry in the late 1950s, and features a first totalizer graduated over 15 minutes at 9 o’clock on the dial, and a second one for the hours at 6 o’clock. This reliable heart, with its silicon balance-spring and escapement wheel assembly and oscillating weight openworked to form the silhouette of a monoplane, comes with a second movement, caliber 7281, housed in the Type 20 Chronographe 2057 case. The military-style variant was inspired by the Air Force’s 1953 specifications, with three sub-dials (small seconds at 3 o’clock, 60-minute chronograph counters at 9 o’clock and 12-hour chronograph counters at 6 o’clock). Both feature a date display in an open window at 4:30. The caliber 728, for which several patent applications have been filed, as well as its declination, deliver a high power reserve of 60 hours to suit modern short-time measurement.
