SW510 M MP b

Manual-winding monopusher chronograph featuring a single push-button at 2 o'clock, with hours, minutes, and small seconds at 9 o'clock. Includes a central 60-second chronograph hand and a 30-minute counter at 3 o'clock (optional 15-minute version as SW511 M MP b). Built with manual winding, stop-second, 28,800 vibrations per hour (4 Hz), 23 jewels, and a 63-hour power reserve.