Created in 1931 at the height of the Art Deco artistic movement, the original design of Reverso was governed by the Golden Ratio. A mystical number represented by the Greek letter φ (Phi) and simplified as 1.618, the Golden Ratio is recognised as a universal signifier of beauty and harmony. In watchmaking, Jaeger-LeCoultre’s Reverso expresses this principle with the utmost eloquence. While many variations of the Reverso case have been presented over the nine decades since then, the original proportions have remained as an anchor for the collection, and the Golden Ratio continues to define the Reverso’s design today.