De Bethune

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DB25

Perpetual Calendar

Reference: DB25QPARS1

The De Bethune interpretation of the perpetual calendar is imbued with poetry and combines horological finesse with the cutting-edge mechanisms of the Manufacture by uniting moon phases, a star-studded sky and a perpetual calendar within an exceptional timepiece.

functions

Hours, Minutes, Spherical moon phase and leap-year indication at 12 o’clock, Perpetual calendar indicating the month at 3 o’clock, the date at 6 o’clock and the day of the week at 9 o’clock

display

Dial:
silver-toned – hand-guilloché in 12 radiating sectors with apertures indicating the day of the week at 9 o’clock and the month at 3 o’clock – subdial at 6 o’clock indicating the day of the month– leap year indicated by a gold pastille appearing in the starry sky at 12 o’clock – De Bethune star-studded sky in mirror-polished flame-blued steel inlaid with yellow
gold stars – spherical moon-phase indication in palladium and flame-blued steel at 12 o'clock.

Hands:
curved in hand-polished flame-blued steel

case

Rose gold 5N – diameter 44 mm – thickness 11,1 mm 

Attachments:
Integrated, hollowed lugs

Glass:
Sapphire crystal, 1800 Vickers hardness with double anti-reflective treatment
Crown at 3 o’clock, setting in three positions

Back:
Open back in polished rose gold,
Sapphire crystal (1800 Vickers hardness) with double anti-reflective coating

calibre

DB2324 calibre

Movement:
self-winding movement

Diameter 30 mm – 425 parts – ¾ plate with starry decor, sandblasted and snailed by hand – Balance bridge and oscillating weight arms in blued titanium – Hand-polished, chamfered steel parts

- Self-regulating twin barrel, De Bethune Innovation (2004)
- Titanium and platinum balance wheel with blom studs, De Bethune Patent (2008)
- "De Bethune" balance-spring with flat terminal curve, De Bethune Patent (2006)
- Silicon escape wheel
- Spherical moon phase indication accurate to a degree of one lunar day every 122 years, De Bethune Patent (2004)
- Triple pare-chute shock-absorbing system, De Bethune Innovation (2005)
- Optimized oscillating weight in titanium and white gold
- Oscillating weight shock-absorbing system, De Bethune Innovation (2006)

Jewelling:
47 jewels

Frequency:
28,800 vibrations per hour

Power reserve:
5 days

strap

Extra-supple alligator leather, alligator lining

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