Rolex Caliber 4131. - 40mm = 1 1/2" Case, 7" Adjustable Bracelet. 30 Minute Counter Sub-Dial at 3 O'Clock. - White Dial. 12 Hour Counter Sub-Dial at 9 O'Clock. - Index Hour Markers. - Screw Down Crown With Triplock Triple Waterproofness System.
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