This Longines 13.ZN flyback chronograph from 1940 has a solid gold hooded lugs case and the legendary manufacture movement. The Longines Caliber 13.ZN, introduced in 1936, holds a significant place in chronograph history as one of the earliest wristwatch movements with a flyback function—a mechanism that allows the chronograph hand to be reset and restarted instantly with a single push of the reset button, without the need to stop it first. This innovation was designed for aviation and military timing applications, where rapid interval measurement was critical.

The 13ZN was developed entirely in-house by Longines at their Saint-Imier manufacture and was manufactured in limited quantities for a period of approx 10 years, from 1936 to 1946. Hence, its rarity and grail-status among watch enthusiats. The 13ZN is a manually wound column-wheel chronograph with a horizontal clutch and was produced in various versions, with or without flyback, its architecture was designed for both reliability and ease of service—characteristics that made it a preferred choice among pilots, sportsmen, and military professionals during its era. Collectors today regard the 13ZN as one of the finest chronograph calibers of the pre-war and immediate post-war periods, thanks to its robust construction, technical sophistication, and historical importance. Due to its limited production, watches housing this movement are highly desirable.

The 13ZN not only marked Longines’ technical leadership during the golden age of chronograph development but also set a benchmark in functional watchmaking that influenced competitors and successors alike. The watch’s case is solid 18-karat gold and measures 34mm in diameter, excluding the crown. It has its distinctive hooded lugs, a design element that enhances its aesthetic appeal and wrist presence. The case and movement have matching serial numbers, indicating their original pairing. The pressure-locked case back ensures a secure fit, and the plexiglass is in excellent condition, free from scratches or imperfections. The original black glossy gilt dial has a clear and functional layout, with two sub-dials: a 30- minute counter at 3 o’clock and continuous seconds at 9 o’clock. The dial is in a good condition, it shows some light traces of time, A minor restoration was performed to address a scratch in the upper area; otherwise, the dial exhibits a consistent patina, with well-preserved printing.

The watch is fitted with a vintage crocodile strap, complementing its classic design. This timepiece has been serviced in-house and is in good working order. It is delivered with a six-month guarantee and an originality certificate. Worldwide shipping is available, and inquiries are welcome for further information or to arrange a viewing.