[Citizen PROMASTER, an authentic sports watch that combines functionality, durability, and safety] Equipped with a high-spec mechanical movement equipped with a GMT function. This is a classic mechanical watch with a classic design with 24-hour notation on the bezel, and an authentic mechanical watch whose hour hand moves with the operation of the crown. [Classic design with 24-hour notation on the bezel] A gorgeous finish with a mirror finish on the case and part of the band, which uses a lot of hair lines. The lugs that connect the case and band are inspired by the aerofoils of airplanes flying lightly through the sky. The back cover is engraved with an aviation helmet as a symbol of a tool pilots can wear with peace of mind. [Authentic pilot watch] Thick and strong hour and minute hands and 24-hour hands with excellent visibility, index design inherited from past SKY series, rounded and uniquely shaped bezel, and a well-balanced combination of each part. This makes the GMT function stand out. A screw-lock crown is used at the 3 o'clock position to increase robustness. In addition, an aviation slide rule function that comes in handy in the unlikely event of instrument trouble is placed on the rotating endpaper ring to improve operability. [Mechanical self-winding watch] This is a mechanical self-winding watch powered by a mainspring. When you wear a watch on your wrist, the movement of your arm moves the rotating weight inside the watch, which automatically winds the mainspring. You can also wind the mainspring by hand. (You can also check the operating instructions from the instruction manual on the manufacturer's website.) [Product details] Mechanical watch, automatic + manual winding, -10 to +20 seconds/day, approximately 50 hours (maximum winding), sapphire glass (non-reflective coating), case/band: stainless steel, water resistant to 20 atmospheres, 2 types of magnetic resistance, luminous (hands + index), aviation slide rule, screw lock crown