Corum is pursuing its commitment on behalf of research on Duchenne muscular dystrophy and creating a new unique piece to be included in the Only Watch 2011 auction: a Golden Bridge Automatic presented with a Titalyt-treated titanium case housing a white gold baguette movement with automatic linear winding.
This one-of-a-kind watch is inspired by a new model presented at Baselworld this year, the Golden Bridge Automatic. Corum presents its new baguette movement with automatic winding in a unique titanium case, coated with an anthracite colored Titalyt treatment.
The new Corum Caliber C0313, an automatic linear-winding baguette movement, required over four years of development and testing to perfect. Equipped with a linear oscillating weight made in platinum and visible from all four sides of the case, along with a slipping spring mechanism, this Golden Bridge movement beats at a frequency of 4 Hz (28,800 vibrations per hour) with a 40-hour power reserve. This 194-part caliber is also fitted with a variable-inertia balance as well as a barrel that is miniaturized to maintain the vertical lines of the mechanism. The mainplate and bridges are made from 18k white gold and adorned with a new vertical guilloché motif matching the linear design of the oscillating weight.
The complexity of such a movement lies in resolving the inertia issues inherent in any linear-winding system. Hence the use of a precious and dense metal – platinum – for this oscillating weight. Weighing 4 grams, the weight slides 1 cm before its motion is slowed down or “damped” by a system of gaskets that send it back in the other direction, thereby supplying the movement with the energy it needs to continue running. The design allows the oscillating weight to essentially float on Teflon-coated rails. The contact zones between the chariot and the rails are made from beryllium copper. The energy derived from the winding is transmitted via a rack fixed to the oscillating weight and constantly engaged with a reverser system – ensuring unidirectional winding – equipped with ceramic ball bearings and requiring no lubrication.
This unique caliber is housed within a new tonneau-shaped case in Titalyt-treated titanium, slightly cambered for comfort on the wrist. Featuring matte gray surfaces, it provides superb views of the Golden Bridge automatic movement, not only from both dial and caseback, but also from each of the sides. Four anti-glare sapphire crystals form a showcase for the movement inside. The anthracite-colored two-part dial with a red minute track echoing the Only Watch signature codes conceals nothing of the mechanism and enables observers to admire the linear oscillating weight in motion. The back of the watch is engraved with the Corum logo, and with the “Only Watch Unique Piece 2011” inscription in red.
Fitted with a black crocodile leather strap featuring red stitching and a titanium pin buckle, the new Golden Bridge Automatic Only Watch by Corum is a limited edition of one.