DB26 Perpetual Calendar Technical Details

Name: DB26 Perpetual Calendar
Reference: DB26WS1

Functions: Hours – minutes – date at 9 o’clock, perpetual calendar indicating days at 11 o’clock, months at 7 o’clock – De Bethune spherical moon-phase indication at 3 o’clock

Technical features of calibre DB2005
Number of parts: 348
Jewelling: 29 jewels
Diameter: 30 mm
Power reserve: 5 days, ensured by a self-regulating twin barrel
De Bethune Innovation (2004)

Specificities: Titanium/platinum balance wheel
De Bethune Patent (2008)

"De Bethune" balance-spring with flat terminal curve
De Bethune Patent (2006)

Triple pare-chute shock-absorbing system
De Bethune Patent (2005)

Frequency: 28,800 vibrations per hour
Adornment: Mirror polished plate
barrel bridge cover decorated with “De Bethune stripes”
Hand snailed barrels
Hand-polished, chamfered steel parts

Display: Silver-toned with apertures indicating days of the week and months, sub-dial indicating days of the month at 9 o’clock – De Bethune star-studded sky in flame-blued steel
De Bethune spherical moon phase indicator – leap year at 3 o’clock
Hands: Sapphire Crystal wrapped with flamed-blued steel

Case and strap:
Case material: White gold 5N
Case diameter: 44.4 mm
Case thickness: 16,10 mm
Lugs: floating lugs in titanium – De Bethune Patent
Crystal: Sapphire crystal, 1800 Vickers hardness with double anti-reflective treatment
Case back: Open with sapphire crystal, 1800 Vickers hardness with double anti-reflective treatment
Strap: Extra-supple alligator skin, lining in alligator
Buckle: Pin buckle