No watch has ever had to withstand so severe a challenge as Guy Delage’s travelling companion : immersion in sea water 10 hours a day during 55 days on the wrist of a man determined to swim across the Atlantic. Entirely crafted in stainless steel and water-resistant to 300 m, fitted with a Swiss-made quartz movement, the SGE 650 chronograph possesses exceptional technical qualities that enabled it to run without a hitch during the entire crossing. Featuring luminous hands and hour markers, its dial is protected by a highly resistant sapphire crystal. A screw-locked crown further contributes to the case’s exceptional watertightness. A unidirectional rotating bezel keeps track of immersion times.