Longines A fine and historically important stainless steel flyback chronograph wristwatch Ref. 5009, circa 1941 Case: Stainless steel Diameter: approx. 37 mm Movement: Manual, cal. 13ZN, column-wheel chronograph with flyback Dial: Silvered with tachymeter and telemeter scales Bracelet/Strap: Leather strap Accessories: —Box original Produced in 1941, the present watch is a superb example of Longines’ legendary reference 5009, fitted with the celebrated calibre 13ZN, widely regarded as one of the most important chronograph movements ever manufactured. The stainless steel case, preserved in attractive condition, features well-defined lugs and retains its original snap-on caseback stamped “Acier Inoxydable Staybrite”. Watches in steel are considerably rarer than their gold counterparts and are today among the most sought-after configurations of the 13ZN. The original silvered dial is exceptionally well balanced and displays a classic bicompax layout, with subsidiary seconds and a 30-minute chronograph register. It is further enhanced by blue tachymeter and telemeter scales, applied Arabic numerals, blued steel hands, and the signature “Antimagnetique”, all elements emblematic of Longines’ high-grade chronographs of the early 1940s. Powering the watch is the legendary Longines calibre 13ZN, a manually wound chronograph movement featuring a column wheel and a flyback function integrated from inception, an extraordinary technical achievement for its time. Renowned for its refined architecture, reliability, and aesthetic beauty, the 13ZN represents the pinnacle of pre-war chronograph design and remains a benchmark for collectors and scholars alike. Highly prized for its historical significance, mechanical sophistication, and timeless design, the present Longines 13ZN reference 5009 stands as an outstanding and highly desirable example of one of the greatest chronograph wristwatches of the 20th century.