DB15

Specifications

About this reference

In 2004, for the first time in a wristwatch, the spherical moon phase indication emerged from a sub-dial rotating on its own axis. The perpetual calendar mechanism, which was the first to be produced entirely at the Manufacture, has an additional world-first function of rapid date adjustment by an intermediate position of the winding crown. Specification: Case: Platinum; Case · Diameter: 43.4 mm; Case · Thickness: 12 mm; Case · Lugs: Ogivial lugs; Case · Crystal: Sapphire crystal (1800 Vickers hardness), with double anti-reflective coating; Case · Case back: Sapphire crystal (1800 Vickers hardness), with double anti-reflective coating; Function: Hours, Minutes, Perpetual calendar indicating the day at 9 o’clock and the month at 3 o’clock, Spherical moon-phase indication and leap-year indication at 12 o’clock; Calibre · Calibre: DB2509; Calibre · Type: Mechanical hand-wound movement; Calibre · Power reserve: 4 days, ensured by a self-regulating twin barrel, De Bethune Innovation (2004); Calibre · Number of parts: 499; Calibre · Jewelling: 48 jewels; Calibre · Diameter: 30 mm; Calibre · Frequency: 36’000 vibrations per hour; Calibre · Adornment: Hand-crafted finishing and decoration; Calibre: Chamfered and hand-polished steel parts; Calibre: “Côtes De Bethune”; Dial: Silver-toned or anthracite, guilloché motif in gold; Dial: Apertures indicating the day at 9 o’clock and the month at 3 o’clock, dial indicating the day at 6 o’clock; Dial: De Bethune star-studded sky in flame-blued steel set with gold stars, featuring spherical moon-phase indication in platinum and flame-blued steel with an accuracy of one lunar day every 122 years at 12 o’clock, De Bethune Patent (2004); Dial: Leap year indication at 12 o’clock; Dial: Hands:; Dial: Curved, in hand-polished and flame-blued steel; Technical features of calibre: Titanium and platinum balance wheel, De Bethune Patent (2005); Technical features of calibre: “De Bethune” balance-spring with flat terminal curve, De Bethune Patent (2006); Technical features of calibre: Spherical moon-phase indication accurate to a degree of one lunar day every 122 years, De Bethune Patent (2004).