Not many watch models endure for 90 years, but Jaeger-LeCoultre’s iconic Reverso, famously developed for polo players in 1931, is a significant exception. The model’s clean Art Deco lines and pivoting rectangular case — originally designed so the watch’s front side could be flipped over to protect the crystal from being shattered by an errant polo ball — have remained popular into the modern era, helping the Reverso grow into the Swiss maison’s flagship collection, incorporating numerous materials, colors, and complications.