1930s Jaeger DUO-PLAN | Edmond Jaeger Case Made in Paris | Black Glossy Dial | With Its Original Buckle

In the early 20th century, the partnership between Parisian watchmaker Edmond Jaeger and the Swiss manufacturer LeCoultre produced some of the most fascinating cross-border creations in horology. During the WWII era and beyond, strict French regulations on gold importation meant that many of these watches, while powered by Swiss movements, were cased entirely in France by local goldsmiths. The result was a uniquely charming hybrid: Swiss precision housed in Parisian elegance. These French-made cases stand apart with their distinct hallmarks, refined architecture, and unmistakable Art Deco flair. At the heart of this example beats the legendary Jaeger-LeCoultre Duoplan movement. Introduced in the 1920s, the Duoplan was a revolutionary answer to the accuracy problems that plagued ultra-thin watches. Its clever two-level construction, separating the gear train from the mainspring, dramatically improved reliability and performance, setting a new standard for miniature horology. For collec