This year, the innovative Swiss watch brand De Bethune incorporates two majestic complications of horology, “Tourbillon & Regulator” in their new wrist watch DB25T and makes a historical breakthrough in the evolution of fine mechanical watches. The De Bethune Tourbillon Regulator is a perfect horology masterpiece which pays tribute to authentic traditions of watch making.
Abraham-Louis Breguet devised the tourbillon mechanism in order to create a dynamic kind of escapement that was lacking because of the static manner in which pocket-watches and marine chronometers were worn in a waistcoat or placed on the deck of a ship. However the wristwatches enjoy a far more active life, which subjects watch movements to chaotic displacements and energy transfers that bear no comparison with those experienced by historical pocket-watches.
In order to compensate for the disorganised violence of wrist movements, the carriage must be as light as possible with as high a frequency as possible and a maximum rotation speed for a minimum mass and inertia. De Bethune has therefore created a 0.18 g silicon-titanium tourbillion in a carriage spinning once every thirty seconds at its axis, and a balance oscillating at a frequency of 36,000 vibrations per hour. This tourbillon is the lightest on the market (classic counterparts weigh four times as much) and comprises 50 parts, of which the lightest weighs less than 0.0001 grams and the “heaviest” 0.0276 grams!
The result is an impressive mechanical ballet that is rendered technically feasible by the use of new technologies, and which is bound to move the hearts and minds of all devotees of classic mechanical watchmaking. The pared-down formal approach to the components features simplicity where needed and complexity where due. The light, airy style is undergirded by deeply thought-out ideas. The fascinating gyration of the tourbillon carriage is matched by the steady, ample beat of the seconds. This model epitomises the very foundations of horological emotions and a form of absolute and uncompromising beauty.
DB2109 – mechanical hand-wound
Mainplate: hand-decorated and snailed, hand-chamfered and polished steel parts, De Bethune stripes
Natural fired-blue titanium bridge
Self-regulating twin barrel
Thermo-compensated silicon/platinum balance wheel
Balance-spring with flat terminal curve*
Ultra-light 0.18 gram silicon/titanium tourbillon
Jewelling: 45 jewels
Frequency: 36,000 vibrations per hour
Power reserve: 100 hours
Hours & minutes
Central jumping seconds
Movement operating indicator at 12 o’clock
Seconds indicator 30 ”
44.6 mm in diameter in white or rose gold
Thickness: 10.8 mm
Glass: Sapphire crystal with double glare-proofing, 1800 Vickers
Crown: Screw-locked at 3 o’clock – adjustable in two positions
De Bethune star-studded sky in blued steel with gold stars – Sterling silver hours and minutes ring
Hands: hand-polished steel, Open back revealing the 30-second rotating silicon/titanium tourbillon with jumping seconds
Extra-supple alligator leather with pin buckle