Rolex 520

The Rolex Caliber 520 is a manually wound, rectangular “form” movement from the Art Deco era of the 1930s and 1940s. It was designed specifically for ladies’ “Tonneau” (barrel-shaped) and rectangular watches. True to the elegant style of the period, the Caliber 520 is a simple time-only movement, featuring only hour and minute hands, which allowed for clean, uncluttered dial designs. It represents a key part of Rolex’s history in creating high-quality, fashionable ladies’ timepieces.