Chronoswiss Opus Chronograph and Grand Opus Chronograph – New Black Editions

Seeing black also has its good sides as Chronoswiss now proves with new case variations on some well-loved timepieces: the skeletonized automatic chronographs Opus Chronograph and Grand Opus Chronograph are now available in black.

Behind the mysterious “darkening” is an innovative coating that goes by the name of Dianoir®, which is based on pure carbon and belongs to the family of diamond-like carbon, known in the industry as DLC.

Different from many commercially available coatings that are physically created from a gas in a vacuum chamber using chemical reaction (PE-CVD) or through condensation (PVD), the DLC coating Chronoswiss uses called Dianoir® is the result of a novel, patented process.

Using a pulsating ray of light, a plasma is created in a vacuum environment that is aimed at the substrate to be coated. Thus, a much higher amount of diamond is created that produces more than double the hardness of the coating: more than 5,000 HV (Vickers) in contrast to the hardness created in the usual process that ends up at 2,500 HV.

Chronoswiss Opus Chronograph Black
Chronoswiss Opus Chronograph Black

It was not only the extremely robust and high-quality character of the ultrahard coating that prompted Chronoswiss to use it, but also its exceptional aesthetic qualities: the transparency of the skeletonized models in their new “light” seems almost like black magic, opening a totally new perspective into the inside of the black case for the observer. So that the signs of the times cannot be overseen, the hands are painted bright red and/or luminous white.

Chronoswiss Grand Opus Chronograph Black
Chronoswiss Grand Opus Chronograph Black

This innovative coating of diamond-like carbon lends the Grand Opus Chronograph and Opus Chronograph models a fully new look—the “dark side” of the fascination of mechanics.

Technical details

Models: Opus Chronograph CH 7525 S & Grand Opus Chronograph CH 7545 S
Type: Skeletonized chronograph, automatic

Sweep hours and minutes, seconds, analogue date, sweep chronograph seconds, 30-minute counter, 12-hour counter

Solid 39-part case, fluted screw-down bezel with full thread and antireflective sapphire crystal, screw-down polished case back with full thread and anti-reflective sapphire crystal, onion-style crown (crafted in solid metal of the case), screw-in lugs with patented Autobloc System, water-resistant to 3 atm

Opus Chronograph: Ø 38 mm, height 14.6 mm
Grand Opus Chronograph: Ø 41 mm, height 14.6 mm
Case variations: Stainless steel with DLC coating (Dianoir®)

Chronoswiss Caliber C.741 (base caliber ETA Valjoux 7750)
Modification Skeletonization of the chronograph
Diameter Ø 30 mm (13 1/4´´´)
Height 7.90 mm
Jewels 25 jewels
Balance Glucydur, three-legged
Balance spring Nivarox I
Fine adjustment Via excenter cam
Shock protection Incabloc shock protection
Frequency 4 Hz., 28,800 vph (oscillations)
Power reserve Approx. 46 hours
Special features : Skeletonized and gold-plated rotor with côtes de Genève, ball
bearings, polished pallet lever, escape wheel and screws, bridges and base plate with perlage, a number of chrome-blackened components

Individually numbered, metal dial, painted black
Hands: Steel hands painted red and/or white, hand-finished, Breguet

Louisiana crocodile skin
Clasp : Buckle or folding clasp

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