Credits: Article and images by Cheryl Chia @ Revolution Watch Magazine. See the original article here - https://revolutionwatch.com/de-bethune-db25-starry-varius-aerolite/
The DB2109V4 is equipped with two barrels, each fitted with six jewelled blades, arranged like a propeller, on both the upper and low faces of the barrel, to minimise friction of the mainspring against the interior of the barrel. This optimizes energy transmission, simultaneously reducing wear.
Elevated above all else in the movement is the skeletonised, blue titanium bridge that retains a secondary escapement for the deadbeat seconds. It comprises of a pair of solid-gold escape wheels mounted in a co-axial configuration, along with a coiled spring and jewelled pallet. The pallet swings back and forth, releasing the wheels one tooth at a time, advancing the seconds hand in jumps.
Right below the mirror-polished delta-shaped bridge is the high speed and high frequency tourbillon. It contains a balance wheel that oscillates at a frequency of 5Hz, or 36,000 vibrations per hour, which is extraordinarily high for a tourbillon while the cage makes one revolution every 30 seconds, twice the speed of a conventional tourbillon.
Credits: Article and images by Cheryl Chia @ Revolution Watch Magazine. See the original article here - https://revolutionwatch.com/de-bethune-db25-starry-varius-aerolite/