Speedmaster Professional Moonwatch

The 3570.5 is powered by the caliber 1861, the workhorse manual-winding chronograph that succeeded the 861, again with a 48-hour reserve and 21,600 vph. It pairs the standard black matte Moonwatch dial and aluminum tachymeter bezel with a stainless steel case and bracelet, rated to 50 m. Within the…

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