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Alpina’s the Seastrong Diver 300 Chronograph Big Date Collection turns in just one direction: anti-clockwise. In addition, the 60 minutes markers on the black bezel are luminous, as are the dial indexes, which perfectly contrast against the matt black dial. Built-in features that are relevant to the professional diver include a 44 mm black PVD coated, cushion shaped, stainless steel case, screw-in crown and case-back, a scratch-resistant sapphire crystal and a black water-resistant rubber strap.