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steel, push back, flexible lugs.
very good, refinished
very good, capable of running, cleaning recommended
The very first series of chronograph calibre 13ZN was designed as a single pusher model without flyback function and works similar to the first chronograph calibre ever made, which was calibre 13.33Z developed in 1913. The chronographs were designated "transitional 13ZNs"; they featured enamel dials and are very hard to find today.
In 1936 Longines began producing calibre 13ZN, the first chronograph mechanism with flyback function and two pushers; the company also applied for a patent for it. This particular type of chronograph was designed specially for pilots, who very much depended on ease of use for zero-setting or starting and stopping their chronographs. After a production run of approximately 11 years, calibre 13ZN was replaced by calibre 30CH in 1947 – which would eventually become a cult icon.