DB28T Tourbillon Jewellery

Functions: hours – minutes – power reserve indication on the back – 30-second tourbillon
 
Movement: mechanical hand-wound DB 2019 calibre
Diameter 30 mm – 298 parts – polished steel – hand-crafted finishing and decoration
Self-regulating twin barrel*
Silicon/white gold balance wheel – balance-spring with flat terminal curve*
De Bethune silicon/titanium 36,000 vph 30-second tourbillon*
Silicon escape-wheel*
Jewelling: 35 jewels
Frequency: 36,000 vibrations per hour
Power reserve: 5 days
 
Case: distinctively shaped – diameter 42.60 mm in grade 5 titanium, distinctively shaped set with 239 baguette-cut and 535 round-cut diamonds totalling 6.02 cts
Attachments: long floating lugs* in grade 5 titanium set
Crystal: sapphire crystal, 1800 Vickers hardness with double anti-reflective treatment
Crown: screw-down at 12 o’clock, setting in two positions
Back: solid, in mirror-polished grade 5 titanium – linear power-reserve display
 
Display:
Dial: De Bethune star-studded sky in blued mirror-polished titanium inlaid with white gold stars and diamonds Diamond-set titanium hours ring with 12 cabochon-cut sapphire hour indicators – De Bethune 30” silicon/titanium tourbillon, 36,000 vph
Hands: in hand-polished steel
 
Strap: extra-supple alligator leather strap with diamond-set pin-buckle

*  Manufacture De Bethune patents and innovations