1 Sapphire mirror, calendar 2.5x magnifying glass, the effect is synchronized with the original version. 2 Oyster case structure, one-piece middle case, screw-in bottom cover and winding crown super waterproof Structure size and thickness are the same as original, diameter 40 mm, thickness 12 mm 4 Equipped with 2836 self-winding movement, quick-adjust instantaneous day and day calendar, synchronizing time, thickness and structure with the original version