Stainless steel manual-winding tonneau-shaped gentlemans wristwatch water-resistant with screwed case-back subsidiary seconds at 9; the movement protected inside a soft iron calotte (protective container) against magnetic fields; and three horological complications: 1/5 second chronograph (tachometer graduation on the bezel to 500 units per hour) with round push-pieces Half-instantaneous 30-minute recorder (subsidiary dial at 3 oclock) Dragging 12-hour recorder (subsidiary dial at 6 oclock)