IWC Portofino Chronograph White Dial Black Leather Strap Watch for Men - IW391024IWC Portofino Chronograph 150 Years 42mm watch. Model reference: IW391024. This stylish watch represents a timeless elegance in a consummate form. The rounded 42mm case of 13. 6mm thickness is performed in stainless steel. The white dial has applied indexes, Roman Numerals, and leaf shaped hands. The sub dial at the 9 o'clock serves for seconds counting. The thin central hand serves as a seconds chronograph. There are also 12 hour and 30 minute