The 13.33Z was developed in 1913 and featured 18 jewels, a diameter of 13 lignes (29 mm) and height of 6 mm, beat at 18,000 vph and utilized a Breguet hairspring. It had a crown that was used for winding the watch and served as a pusher for the chronograph. The first push starts the chronograph, the second stops it, and the third resets, and the cycle repeats. This was the first chronograph wristwatch movement. |
in 1936 Longines began to produce one of the most technologically advanced chronograph movements at the time – the Caliber 13ZN. As we mentioned at the beginning, Longines developed the first chronograph for the wristwatch – the 13.33Z – but this was the first chronograph mechanism equipped with the flyback, or retour-en-vol, function. The 13ZN had 17 jewels; a diameter of 29.80 mm and height of 6.05 mm, and beat at 18,000 vph, and was equipped with a Breguet hairspring.
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In 1947, Longines followed up with what many regard as one of the finest and most beautiful wristwatch chronograph movements ever, the Caliber 30CH. |