[Citizen PROMASTER, an authentic sports watch that combines functionality, durability, and safety] Introducing a model equipped with a new caliber [H864] from the authentic pilot watch [SKY] series. Adopts a disc hand with UTC time on the 6 o'clock subdial. This is a unique model that allows you to read the approximate time in cities in the northern hemisphere when combined with the numbers on the ring at 6 o'clock. This disc needle slowly makes one revolution over the course of a day. [Design] Inheriting the design of the SKY series. Despite the imposing large dial and bezel, the mortar-shaped case body is lightweight and comfortable to wear. While the matte finish takes advantage of the hairline, mirror processing is applied to the bezel slope and push button guard, giving it a sharp look. [Citizen's radio-controlled clock that keeps accurate time at all times] Equipped with Citizen's proprietary light-powered Eco Drive technology that does not require periodic replacement. A world time radio clock that synchronizes to accurate time no matter where you are. It is packed with radio-controlled clock technology that Citizen has been challenging for 30 years. [Invention for long-term use] The sapphire glass is scratch resistant and highly transparent, and has an anti-reflective coating that prevents light from reflecting on the glass surface. Water resistant to 20 ATM. Convenient date and luminous (hands + index). Fonts often seen on old maps and aviation charts are used for the notation of each city and the numbers on the disc. We also aim to improve legibility by using a font that is different from that of the aviation slide rule section. [Product Details] Photovoltaic Eco Drive radio-controlled watch, ±15 seconds/month (when not receiving data), Photovoltaic generation: Approximately 2.5 years, Sapphire glass (non-reflective coating), Case/Band: Stainless steel, Water resistant to 20 ATM, Magnetic resistance 1 Seeds, luminous (hands + index), aviation slide rule, dial parts: recycled materials, screw lock crown