The De Bethune DBS
The DBS was the first watch by De Bethune to have their now signature 3D moonphase complication. They make it by taking a half sphere of steel and a half sphere of palladium and combining them to form a full sphere. Both halves of the sphere are silvery-colored to start with, but then they apply heat. The metal properties of steel are such that it turns blue at a noticeably lower temperature than palladium, so the steel half of the sphere ends up turning blue while the palladium side is perfectly unchanged. The result is a perfect half-blue sphere. Such is the level of detail that exemplifies De Bethune. Click to take a closer look at this piece!