The mono-pusher DB29 chronograph comes in a rose-gold case and features the brand’s trademark cone-shaped lugs. The double case back is fitted with an invisible hinge so as not to detract from its clean lines. A single push button, coaxial with the crown at 3 o'clock, operates the chronograph.
Five central hands
The design of the DB29 Maxichrono Tourbillon’s dial with its five central hands aims to make it easier and more attractive to read the chronograph indications by doing away with the small subdials of the conventional chronograph. The hands are designed to follow the different shapes and curves of the silver-toned dial. They are all in hand-polished steel that has been flame-blued by the company’s craftsmen, apart from the chronograph minutes hand, which is in rose gold.
Measuring long elapsed times: 23 hours, 59 minutes and 59.9 seconds
This instrument measures long elapsed times with counters for 60 seconds, 60 minutes and 24 hours. The central chronograph hands are mounted on co-axial stacked wheels.
Thanks to the precision ensured by the De Bethune 30-second Tourbillon in silicon and titanium oscillating at a rate of 36,000 vibrations per hour – one of the fastest and lightest on the market with its 63 parts weighing a total of 0.18 grams – time is accurately measured and the maximum duration of elapsed-time measurements amounts to a generous 23 hours, 59 minutes and 59.9 seconds.
A push button at 4 o'clock opens the cover on the sapphire-crystal glass of a titanium case back to reveal the calibre DB2039 movement with its polished steel bridges, the tourbillon at 3 o'clock and the complex mechanism featuring three column-wheels.
De Bethune total clutch system: a patented chronograph invention
De Bethune has announced the filing of a patent application n° CH00076/14 for the chronograph mechanism. De Bethune’s absolute clutch aims to improve the performance of chronographs by correcting the faults identified in current mechanisms.
This mechanism makes the most of the advantages of the horizontal and vertical clutch systems while eliminating their faults. It thus benefits from a marked reduction in the friction that affects the movement both when the chronograph is running and when it is functioning without the chronograph engaged.
The absolute clutch operates in a system engaging the two traditional clutch methods to allow the different chronograph counters to function semi-autonomously:
Three different types of clutch behind three semi-independent systems controlled by three column-wheels thus govern the different chronograph elapsed-time counters.