Movement
Calibre 15
← Back to all Calibres1934 – 1936
Lignes
14
Mounting Diameter
31.3
Thickness
6.4
Frequency (vph)
18,000
Jewels
17
Power Reserve
40
Hand Sizes
1.82, 1.18, 0.28, 0.25
Complication
Chronograph
Power
Manual
Shape
Round
Size
Medium
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Notes
The Cal. 15 is a Valjoux 22GH modified with a flyback mechanism and it was used for a short time near the end of the production of the 13.33Z before Longines released their successor in house chronograph movement, the 13ZN. There are some 13.33Z flyback movements that were made experimentally and also were likely retailed. The flyback was becoming an important complication for Longines chronographs at the time due to the brand's growing association with aerial navigation for which the flyback function was particularly useful.