1930s Jaeger LeCoultre very rare FB-case 1st-Waterproof Sector dial in 18K yellow gold

This is a late-1930s Jaeger-LeCoultre, an exceptionally rare first-generation waterproof model featuring an FB-manufactured sector dial in an 18k yellow gold case. This model is particularly notable for its use of an FB-manufactured screw-back waterproof case, a hallmark of the case maker renowned for their work with brands like Patek Philippe on models such as Ref. 565 and Ref. 1463. This is an exceedingly rare early waterproof model, almost never seen in Jaeger-LeCoultre's lineup. The dial showcases a stunning sector design typical of the era, with an appealing patina that enhances its vintage charm. The rarity of the 18k yellow gold case further elevates the exclusivity of this exceptional piece.