Speedmaster Professional Moonwatch

The ST145.022-78 runs the caliber 861, the manual-winding chronograph at 21,600 vph with a 48-hour reserve that succeeded the column-wheel 321. It is listed in a 41 mm stainless steel case with the familiar black matte dial and aluminum tachymeter bezel rated to 50 m, on a steel bracelet, marking…

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