Chronoswiss

Open Gear Flying Tourbillon Underworld

Reference Number :

CH-3123-BKPU

Series : Tourbillon

Retail: $46,400

(As of: 04/2025)

This watch is not for sale, this page is just for reference purposes only. If you would like to purchase this watch, please contact Chronoswiss. If you are interested in selling this watch to us, you can contact us here.

Quick TakePlunge into the mechanical abyss with the Chronoswiss Open Gear Flying Tourbillon Underworld. This isn't just a watch; it's a statement piece limited to a mere 15 souls brave enough to wear this slice of horological darkness. That striking purple CVD coating on the exclusive C.303 manufacture movement isn't just color; it's attitude, gleaming through the multi-level, 42-part dial architecture. You see the Côtes de Genève, the hand-guilloché work, the skeletonized bridges – it's like looking into the engine room of a steampunk dream machine. The flying tourbillon at 6 o'clock isn't just compensating for gravity; it's performing a ballet, a constant reminder of the mechanical lifeblood within. The off-center hours and central minutes keep things functional, while the Super-LumiNova ensures you don't lose track of time in the shadows. With 100m water resistance and a sturdy 44mm steel case, it’s built tough, but the hand-sewn alligator strap adds that touch of dark luxury. It’s complex, it’s bold, and with only 15 ever made, owning one is like holding a secret handshake among the horologically adventurous.

DescriptionThe Chronoswiss Open Gear Flying Tourbillon Underworld, reference CH-3123-BKPU, is housed within a robust stainless steel case measuring 44 mm in diameter and 13.35 mm in height. Constructed from 17 individual components, the case architecture provides substantial structural integrity. Water resistance is rated at 10 bar, equivalent to 100 meters, ensuring protection against water ingress during typical aquatic activities. The case finishing involves a combination of partly polished surfaces and areas with a vertical satin finish, creating visual contrast. An onion-style crown facilitates time-setting and winding operations. Protecting the dial is a curved sapphire crystal featuring a double anti-reflective coating to minimize glare and enhance legibility. This crystal is secured by a polished, screw-down bezel engineered with a full thread and distinctive side knurling for functional grip and aesthetic detail. The reverse side incorporates a screw-down case back with a satin finish, fitted with a sapphire crystal window that permits observation of the intricate movement within. The lug width is specified at 22 mm, accommodating the designated strap.

Powering this limited edition model is the Chronoswiss manufacture caliber C.303, a hand-wound movement distinguished by its semi-skeletonized design and integrated flying tourbillon complication located prominently at the 6 o'clock position. Operating at a frequency of 4 Hz (28,800 vibrations per hour), the movement provides an approximate power reserve of 60 hours when fully wound. It incorporates 23 jewels to minimize friction at critical points. The movement's aesthetic is characterized by an exclusive purple CVD coating applied to various components. Further finishing details include Côtes de Genève decoration on the main plate, circular satin finishing on the skeletonized bridges, a similarly skeletonized spring barrel, and polished screws throughout. The dial presentation is exceptionally complex, involving a 42-part construction arranged across multiple levels. The base level features Côtes de Genève striping. Above this sits the middle level, which is meticulously hand-guilloched and hand-engraved, bearing the "Atelier Lucerne" signature on its reverse. The uppermost level showcases screwed-on, skeletonized train wheel bridges and incorporates a unique funnel-like structure for the hour display, positioned off-center at 12 o'clock. Central minutes are indicated traditionally. Time indication is facilitated by rhodium-plated "Trigono" shaped hands inlaid with Super-LumiNova; the minute hand is uniquely bent by hand. Bar or cylinder-shaped indexes, also treated with Super-LumiNova, mark the hours. Limited to only 15 units worldwide, this timepiece features a hand-guilloched dial and an "open gear" mechanism, exposing elements of the gear train. It is paired with a hand-sewn alligator leather strap secured by a folding clasp.

GenderMen

SignaturesChronoswiss

Country of OriginSwitzerland

Case Size44 mm

MovementHandwound

CaliberC.303

FunctionsHours, Minutes, Tourbillon

Power Reserve60 Hours

Case MaterialsStainless Steel

Bezel MaterialsStainless Steel

Lug MaterialsStainless Steel

Case BackSapphire Crystal