Ten years ago, MB&F showed off their creativity with the HM3 Frog, which pushed the bounds of three-dimensional watch-making. To celebrate the anniversary, the company is launching the HM3 Frog X. It has the same upside-down construction with an oversized winding rotor and signature revolving hour and minute domes that represent the Frog's "eyes." What it adds, however, is an all-new sapphire crystal case that lets every component of the watch shine through. Limited to just ten examples each with a matching rotor, gasket, and Super-LumiNova in purple, blue or turquoise.