
Manual-winding monopusher chronograph featuring a second time zone. Operates via a single cam-actuated push-button at 2 o'clock to display hours, minutes, small seconds at 9 o'clock, a central 60-second counter, and a 30-minute counter at 12 o'clock (optionally 15 minutes for SW531 M MP b). Includes a center GMT/24-hour second time zone with quick-set, manual winding, a stop-second function, 28,800 vibrations per hour (4 Hz), 21 jewels, and a 62-hour power reserve.
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