The Girard Perregaux 30.6 watch movement is equipped with a pin-lever escapement and is primarily found in the Tristop and Troika models. This movement offers several functions, including a timer with a 60-second measurement capacity with 0.1-second precision, a 30-minute timer, and an addition timer. It features manual winding capabilities with a back winder, a sweep second hand, and a 1/10-second display on the escape wheel. The Girard Perregaux 30.6 movement was used during approximately 1988.