This is a 1930s early-production Longines mono-pusher chronograph equipped with the Caliber 13.33 movement, housed in an 18-karat yellow gold case. The Cal. 13.33, a rare in-house movement that predates the renowned Cal. 13ZN, showcases exquisite craftsmanship, including chamfered edges, elegant curves, and oversized jewel settings that surpass other brands of the same era in refinement.
The porcelain dial features a two-tone design with triple scales, dolphin-style numerals, and blue steel Breguet hands, offering an aesthetic that has stood the test of time. Thanks to the porcelain material, the dial remains in excellent condition, free from fading.
The 18KYG hinged case includes a double case back (with the inner back also made of gold), both of which are engraved with the movement details and unique serial numbers. This level of detail encapsulates the world-class quality Longines vintage timepieces are celebrated for.
Additionally, the inner case back bears stamps signifying its dual functionality as a "computer" of its time, as well as an engraving noting its achievement of nine awards at a watch exhibition. This rare piece, featuring the two-tone porcelain dial, is an exceptionally uncommon find among Cal. 13.33-equipped models.