The observation watch for the wrist
The timepiece owes its precision to a balance spring developed and manufactured in-house that beats at a rate of 21,600 semi-oscillations per hour. The sweep-seconds hand is made of blued steel and contrasts well against the dial. When the crown is pulled, it stops instantly. This allows the watch to be set to one-second accuracy. Readily visible through the sapphire-crystal caseback, the sweep-seconds wheel train is integrated between the three-quarter plate and a separate bridge.