Story Seiko’s premier SKX sports watch featuring GMT function After conquering deep sea exploration in the ‘60s, pioneering space timekeeping in the ‘70s, and reshaping the digital domain in the ‘80s, Seiko set its sights on taking the world of sports by storm. As the first sports watch to feature a GMT or “zero hour” function, the Seiko 5 GMT met the dynamic needs of athletes crossing time zones—ensuring that no matter where they were, they were always synced with the heartbeat of the competition. Paired with Seiko’s in-house automatic caliber 4R36 movement, LumiBrite hands for low-light visibility, and a unique transparent case back, this stellar piece marks Seiko’s next stride into melding innovation with functionality, ready to grace the wrists of champions and travelers around the world. Features The first sports watch to feature a GMT or “zero hour” function that allows wearers to know the local time anywhere in the world Manual and automatic winding capabilities Equipped with Seiko’s in-house-made automatic caliber 4R36 movement with 24 jewels and 21,600 vibrations per hour Power reserve lasts approximately 41 hours Framed by a metalized, bi-color GMT bezel LumiBrite hands and indexes for low-light visibility Navy dial features a magnified date calendar and large GMT hand for instant visibility Stainless steel case includes a screw-down transparent case back for a view of the timekeeping in action Two-push button safety clasp is adjustable by five positions for a secure wear and easy on and off Water resistant to 100 meters (330 ft) Materials Case: Stainless steel Bracelet: Stainless steel Crystal: Hardlex Specs Movement Seiko 4R36 Movement Type Automatic with manual winding capacity Duration Approx. 41 hours Case Material Stainless steel Crystal Hardlex Lume LumiBrite on hands and indexes Water Resistance 100 m / 330 ft Case Thickness 13.6 mm Case Diameter 42.5 mm Case Back Screw Crown Screw-down Bezel Unidirectional rotating bezel Jewels 24 Display GMT Clasp Three-fold with secure lock, push button release with extender Distance Between Lugs 46 mm