De Bethune DB28 Kind of Blue Tourbillon DB28TBRBN/S

    In honour of the colour blue, a fundamental element of its identity, De Bethune presents a monochromatic range of its iconic model the DB28 Tourbillon. Radical and magnetic, the colour is created by an artisanal and natural treatment of the metals.

    Functions : Hours, minutes, 30’’ indicator via the ultra-light de bethune tourbillon cage at 6 o’clock, power reserve situated on the back
    Dial : Blued grade 5 polished titanium hours ring with rose gold hour-markers – blued grade 5 satin-polished titanium minutes ring – ultra-light de bethune 30’’ tourbillon in silicon and titanium at 6 o’clock
    Hands : Hand-polished rose gold
    Case : Blued grade 5 mirror-polished titanium – diameter 42.6 mm – thickness 9.20 mm
    Attachments : Short or long floating lugs in blued grade 5 mirror-polished titanium, de bethune patent (2006)
    Glass : Sapphire crystal, 1800 vickers hardness with double anti-reflective treatment crown at 3 o’clock, setting in two positions
    Back : Open back in blued grade 5 mirror-polished titanium that opens on a linear power reserve in rose gold 5n sapphire crystal (hardness of 1800 vickers) with double anti-reflective coating
    Movement : Mechanical hand-wound diameter 30 mm – 282 parts – motion works bridge and cover plate in grade 5 titanium, mirror-polished and blued by hand – bridge cover on the barrel decorated in grade 5 mirror-polished and blued titanium, encrusted by hand with stars in white gold – rose-work grinding by hand on the barrels – decoration on power reserve indicator in grade 5 titanium “de bethune” concentric graining and blued by hand – steel parts bevelled and flame-blued by hand - self-regulating twin barrel, de bethune innovation (2004) - silicon annular balance encircled by a white gold ring, de bethune patent (2010) - "de bethune" balance-spring with flat terminal curve, de bethune patent (2006) - silicon escape wheel - ultra-light de bethune 30’’ tourbillon in silicon and titanium, de bethune innovation (2008)
    Jewelling : 38 jewels
    Frequency : 36,000 vibrations per hour
    Power Reserve : 5 days
    Strap : Extra-supple alligator leather, alligator lining