In 2009, CORUM introduced a Minute Repeater Tourbillon model in red gold (Ref. 010.101.55/0001 A012) to celebrate the 50th anniversary of brand’s iconic collection: the Admiral’s Cup. In 2011, a new Minute Repeater Tourbillon model is presented in a grade 5 titanium case. This material which is ultra-resistant and extremely hard to machine is endowed with the ideal physical properties to ensure perfect resonance of the notes emitted by the striking mechanism. The Caliber CO 010 movement powering the Admiral’s Cup 45 Minute Repeater Tourbillon called for two full years of development that enlisted the talents of around ten of Corum’s finest watchmaking craftsmen.
One of the crucial factors in this equation is the grade 5 titanium case. In addition to its excellent resistance to corrosion – a particularly precious quality within a maritime environment – this alloy was chosen for its excellent acoustic qualities. The pure, crystal-clear sounds emitted are endowed with a rare level of intensity and admirably highlight the complexity of the minute repeater mechanism developed by Corum.
The minutes rack positioned at the heart of the striking system has been inverted compared with traditional minute repeaters in order to give each note added strength and precision. It has also been enlarged to provide a larger angle of lift for each of its teeth, thereby extending the time between notes. The hammers hitting the gongs in order to produce the sound are made from ultra-resistant hardened steel. Fixed to these hammers are counter-springs specially designed to achieve the best possible balance between striking strength and speed. While the minute repeater mechanism is sounding, the overall cadence is regulated by the rotation of an inertial flywheel that is visible on the back of the movement.
The gongs, made from an alloy based on a composition and thermal treatment that remain a jealously guarded secret, have been adjusted to sound the hours on an A note and the minutes on a C sharp. These two notes are no random choice: their specific sequence forms a major third (two tones) creating a more cheerful harmony than that of a minor third (one and a half tones). The overall precision is ensured by a tourbillon with a silicon escapement and lever, a guarantee of both reliability and longevity.
Its hand-wound movement boasts an exceptional 100-hour power reserve. Considerable attention has also been lavished on the elaborate hand-finishing of each surface: the wheels and pinions are circular satin-brushed, the steel parts (and particularly the strike hammers and the tourbillon bridge) are mirror-polished with zinc, the mainplate is circular-grained, and the bridges are decorated with a Côtes de Genève motif.
The creativity and meticulous care devoted to conceiving and crafting Caliber CO 010 are reflected in the exterior of the Admiral’s Cup 45 Minute Repeater Tourbillon. In order to highlight the value of the movement driving this model, Corum has chosen to replace its dial with a smoked PVD-treated sapphire crystal. The latter is even broader than on the previous model and provides stunning views of the intricate minute repeater and tourbillon mechanisms. Its grey-colored treatment, emphasized by the monochrome nautical pennants on the flange, lends this model an understated and yet highly technical nature. The crystal is also engraved with the inscriptions “Corum”, “Minute Repeater” and “Tourbillon”. The 45 mm-diameter case is immediately recognizable thanks to its famous polished satin-finished 12-sided bezel.
The bezel itself also features a hidden function. Mounted on steel runners and delrin blocks to reduce friction, the ingenious bezel of the Admiral’s Cup 45 Minute Repeater Tourbillon serves to wind the minute repeater function by a clever 27-degree clockwise rotation.
Water-resistant to 30 meters thanks to this original system, the Admiral’s Cup 45 Minute Repeater will be issued in a strictly limited production run of 15.
Model: Admiral’s Cup 45 Minute Repeater Tourbillon, Titanium Case
Reference 010.102.04/0001 A015
Limited Edition 15 pieces
CO 010, Manual-winding movement with minute repeater and tourbillon
Tourbillon escapement and pallets in Silicium
Frequency 3 Hz, 21,600vibrations per hour
Special CORUM high-end finish, Côtes de Genève finish on bottom bridges
Power reserve of 100 hours
Hours, minutes, minute repeater, tourbillon
Ingenious mechanism to activate the minute repeater function by rotating the bezel
Typical twelve-sided titanium case, satin-finish case with polished horns
Titanium bezel, satin and polished finish
Titanium crown protector
Crown in titanium, engraved with CORUM key
Titanium 4-screw open back cover with anti-reflective treatment
Glass: Cambered twelve-sided sapphire crystal with anti-reflective coating
Water resistance: 3 atmospheres (99 feet / 30 meters)
Sapphire crystal dial with grey PVD coating, opening on the tourbillon cage at 5 o’clock
Rhodium coated minutes and minute chevrons
Monochrome nautical pennants representing the hours on the black fitted flange
CORUM logo, Minute Repeater and Tourbillon transferred on the dial
Rhodium coated faceted hour and minute hands with white Superluminova
Black crocodile leather strap, width 22/20 mm
Buckle: Titanium tongue buckle, engraved with CORUM logo