Portofino Chronograph

The Portofino Chronograph reference IW391001, made from 2011 to 2015, is a 42 mm stainless steel chronograph powered by IWC's automatic caliber 79320 with a 44-hour reserve at 28,800 vph. It shares its movement and 42 mm proportions with the earlier IW3910, carrying a silver-plated sunburst dial…

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