IWC Concept Watch Special Edition [Case] The data of the watch is 44mm. It is the same as the original, using high-tech reinforced 316 stainless steel [literally] The shape of the aircraft engine. Water chestnut cutting process, the upper and lower layers are matched It’s very difficult. With superb skills and strong patience, it shows a protruding three-dimensional effect. [Mirror]Sapphire crystal glass with blue high-transmittance coating on both sides. The craftsmanship is consistent with the original, and the transparency is close to the original.