With its sleek casing and modern design, the Tank may be the most unlikely fashion piece to come out of World War I. Inspired by an aerial view of a Renault tank, Louis Cartier created it for General Pershing as a token of appreciation for his role in the Allied Victory. But its appeal quickly spread beyond military quarters. Rudolph Valentino famously wore the timepiece in The Son of the Sheik, singlehandedly making pocket watches passé. And over the decades, a who’s who—from Jackie O. to Truman Capote—strapped on one of the Tank’s seven iterations. Among the latest, the Tank à Vis is available with dual-time-zone capability, ensuring that you’re stylishly on time (or fashionably late), whatever city you’re in.