DB28 Steel Wheels Sapphire Tourbillon

Specifications

About this reference

Faithful to the DNA of the ‘Maison’ nestled in Sainte Croix in the Swiss Jura mountains, the DB28 Steel Wheels Sapphire Tourbillon ably perpetuates the heritage of its predecessors: perfect balance, contemporary and bold aesthetics at the service of exceptional mechanics. A limited edition of only 10 pieces. Specification: Case: Polished grade 5 titanium; Case · Diameter: 43 mm; Case · Thickness: 9,20 mm; Case · Lugs: Polished grade 5 titanium floating lugs (2019 version), De Bethune Patent (2006); Case · Crystal: Sapphire crystal (1800 Vickers hardness), with double anti-reflective coating; Case · Case back: Screwed down back in polished grade 5 titanium that opens on a linear power reserve in rose gold 5N; Case: Sapphire crystal (1800 Vickers hardness), with double anti-reflective coating; Function: Hours, Minutes, 30’’ indicator via the ultra-light De Bethune tourbillon cage at 6 o’clock, Power reserve situated on the back; Calibre · Calibre: DB2019V5; Calibre · Type: Mechanical manual-winding calibre; Calibre · Power reserve: 5 days, ensured by a self-regulating twin barrel, De Bethune Innovation (2004); Calibre · Number of parts: 272; Calibre · Jewelling: 39 jewels; Calibre · Diameter: 30 mm; Calibre · Frequency: 36’000 vibrations per hour; Calibre · Adornment: Motion works bridge and concave cover plate in grade 5 titanium, mirror-polished; Calibre: Curved, open worked and beveled barrel bridge with glass blued sapphire; Calibre: Open worked and hand sailed barrels with glass blued sapphire and blued titanium beveled rings; Calibre: Rhodium power reserve indicator background decorated with “De Bethune” circular graining; Calibre: Blued and engraved ring; Calibre: Steel parts beveled and polished by hand; Dial: Circular-grained titanium hours ring; Dial: Spherical polished titanium hour-markers set and 30” dial on a blued polished titanium circle; Dial: Ultra-light De Bethune 30’’ tourbillon in silicon and titanium at 6 o’clock – De Bethune Innovation (2008); Dial: Hands:; Dial: Minutes and hours hand in hand-polished sand-blasted blued titanium; Technical features of calibre: Titanium balance wheel with white gold inserts, optimised for temperature differe