Automatic Chronograph movement: Manufacture Concepto base, exclusively modified for Edouard Koehn. 28,800 vibrations per hour (4Hz), 25 jewels, 60-hour power reserve, 262 components. Chronometer-grade regulating organ Functions: Hours, minutes, small seconds at 9 o’clock, date by hand & moon phase indicator at 6 o’clock Chronograph: 60 seconds by central hand, instantaneous 30-minute counter at 3 o’clock Case: 316L stainless steel, 40.0 mm diameter Water resistance: 50 meters Thickness: 12.90mm without sapphire crystal, 14.10mm with domed “glass-box” sapphire crystal Crystal: Double-sided anti-reflective domed sapphire (“glass-box” type) Case back: Sapphire crystal Limited editions: 50 pieces per style, individually numbered on the case back Dial: gradient blue with vertical satin finish and applied arabic indexes Strap: Blue Louisiana alligator leather with alligator-flank lining Clasp: Stainless steel folding clasp, pin buckle available as an option