Sinn Chronograph 356 Sa GR 356.077

Helmut Sinn, a pilot and blind-flying instructor, founded the Frankfurt company in 1961 to make navigation watches and pilot's chronographs. The 356 series is a bicompax pilot's chronograph, its design drawn from a Sinn chronograph of 1998, in a 38.5 mm steel case 15 mm thick that takes a 20 mm strap.

Among the other 356s, the 356 Sa Pilot (356.07) has the same case with a black dial and the 356 Sa Pilot III (356.0721) a silver one. The 356 Pilot (356.02) is slightly thicker at 15.5 mm. The Pilot Chronograph 103 St Sa (103.061) moves to a 41 mm case with a 60-minute countdown bezel.