Roger Dubuis is known for experimenting with case materials, with a distinctive aesthetic to the combination of material and complication. In this latest release, the Excalibur Twofold, it brings their double tourbillon into a watch with three highlights – a new white composite material, a lumed skeletonised movement, and a lumed strap.
The 45mm-sized mono block case has a water resistance of 30m and is made from Mineral Composite Fiber (MCF), a new material developed for Roger Dubuis. A stark white with a satin-like finish, it is 99.95% silica. The material is made by layering thin sheets of the quartz and combining it with an epoxy resin to which a white colouring agent is added during a process called Sheet Molding Composite (SMC), resulting a white colour that will not fade/ change over time. After this, the raw shape of the case is milled. For the new Excalibur Twofold, this new composite material has also been applied to the top surfaces of the double tourbillon and star bridges of the skeletonised movement.
The dial features an MCF flange with screw-like hour markers polished and filled with Super-LumiNova. Functionally, we have hours, minutes, and a double tourbillon at 5 o’clock and 7 o’clock.
The skeletonised double flying tourbillon is part of the manual-wind in-house Calibre RD01SQ which beats at 21,600 VPH and has a power reserve of 50 hours. It features circular-grained and NAC coated plate and bridges. The skeletonised dial and signature star bridges of movement have a long (60% longer) lasting Super-LumiNova applied to the angles of the MCF-coated bridges.
The third and final point of note mentioned at the outset is a rather cool glowing strap. It is rubber-based, but with the use of a luminescent material mixed in with the rubber before molding. This process has been named ‘LumiSuperBiwiNova™’.
The Excalibur Twofold (Ref. RDDBEX0900) is limited to just 8 pieces. It comes on a FKM luminescent rubber strap based on LumiSuperBiwiNova technology, a world first, with a titanium double folding buckle.
Materially and luminescence-wise (especially the strap), this is a an intriguing new watch, and it will be interesting to see how Roger Dubuis uses MCF in the future.
[Photo credit : Roger Dubuis]