Details An extremely rare, collectible and fine rose gold perpetual calendar wristwatch of the Swiss watch brand De Bethune, founded in by the Italian vintage watch dealer David Zanetta and French watchmaker Denis Flageollet.
Reference launched in Case in 18k rose gold, diameter Caliber DB, manual-winding , De Bethune patented 4-spoke titanium balance with platinum ogival weights, De Bethune patented self-compensating free sprung hairspring with flat end-curve, double barrel, power reserve up to 5 days. De Bethune black leather strap. De Bethune pin buckle in 18k rose gold. In , just two years after its founding, De Bethune launched the ground-breaking DB15 perpetual calendar, embedded with an impressive list of unique features.
The most notable innovation is the astronomical moonphase indicator, accurate to one lunar day every years, with a lunar sphere made of platinum and blued steel that rotates around its axis representing the evolution of the moon phase.
The caliber DB of the present reference features a 4-spoke titanium balance with platinum ogival weights, and self-compensating free sprung hairspring with a flat end-curve , both patented by De Bethune. Having an impressive 5-day power reserve, it was developed in and designed in the characteristic De Bethune style, with an early version of their branded shield-shaped barrel bridge. The short lived DB17 collection was an evolution of the DB15 style, with a few differences.
It is known that the DB17 Perpetual Calendar, launched in , was equipped with an advanced version of the DB caliber, which had a De Bethune triple pare-chute shock-absorbing system.
