Automatic Chronograph movement, Concepto base exclusively modified for Edouard Koehn 28’800 vibrations per hour 4hz, 31 jewels, 48 hours power reserve, 282 parts. Top chronometer quality regulating organ - balance spring Functions : Hours, minutes, seconds sub-dial at 6 o’clock Chronograph : 60 seconds Chronograph by central hand (red hand), central Split-Seconds chronograph (blue hand), instantaneous 60-minute chronograph register at 12 o’clock 316L Stainless steel case, with coaxial crown-pusher to activate the split- seconds chronograph Diameter : 40.0 mm Height : 13.10mm without glass box sapphire crystal 14,60mm with sapphire crystal 50 meters water-resistant Double sided antireflective glass box sapphire crystal Dial: Grand feu white enamel - inspiration from the original pocket watch dial Sapphire crystal case-back. 50 pieces limited edition in steel, individually numbered on the case back Louisiana alligator leather strap with alligator leather lining. Dimensions 20mm x 18mm Steel folding buckle – pin buckle optional