De Bethune DB25 Perpetual Calendar 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
    Dial : Cilver-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
    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 : 6 days
    Strap : Extra-supple alligator leather, alligator lining