1972 Sicura Yachting Diver Chrono, manual winding movement, 42.3 x 45mm case.
Sicura was a company owned by Ernest Schneider, specializing in big sport watches of innovative design in the 60s – 70s. Sicura was able to purchase Breitling when it went into receivership in 1979 and remains the current owner.
Yacht timers are also known as yachting chronographs, sailing watchers or regatta timers and they were designed for the countdown before the start of a sailing race. The start of a regatta is quite different from a race on the ground: the sailboats are positioned before the starting buoy and when the gun goes off, the countdown begins and the competing boats cross the start line 15 minutes later. So, yacht timers are used on the countdown and they also denote the remaining time of the race.