As a result of Longines' long-standing watchmaking tradition, Record automatic models combine craftsmanship excellence and classic elegance, aspire to become the brand's leading edge. And these exceptional timepieces, whose movement includes a monocrystalline silicon spiral barbell with unique properties, certainly do not lack arguments. For the first time, Longines has been awarded the "chronometer" certification by the Contr ? le officiel suisse des chronom ? tres (COSC), a title bestowed on all creations in the Record collection. Check-in MATERIAL Stainless Steel GLASS Domed scratch-resistant sapphire crystal with multilayer anti-reflective treatment on the inner side SIZE ? 40 mm WARMING Waterproof to 3 bar FOUNDER Clear sapphire crystal case back Dial and hands COLOR Glosssy lacquered black TOUR OF THE HOURS Diamond indices DIAMOND Dial with 13 Top Wesselton VS-SI diamonds, for a total of 0.059 carats HANDS Glosssy silver hands Movement and Functions MOVEMENT TYPE Automatic GAILE L888.4 DESCRIPTION OF MOVEMENT Self-winding mechanical movement with frequency of 25,200 revolutions per hour and power reserve of approximately 72 hours, monocrystalline silicon balance-spiral Function Hours, minutes, seconds and date SPECIAL FUNCTION COSC certified chronometer Strap MATERIAL Steel BUCKLE With triple-safe folding closure and pressure opening mechanism