|Diameter:||39 mm (17.5 ligne)|
|Complications:||5-Column Chronograph, Chronograph, Column Wheel Chronograph, Monopusher Chronograph|
|Hands:||30 Minute Chronograph Hand at 3:00, Central 60 Second Chronograph Hand, Central Hour Hand, Central Minute Hand, Small Seconds Hand at 9:00|
|Distinguishing Technical Characteristics|
Clockwise Balance Cock
Cal. 9 is a monopusher 17.5 ligne (39 mm) chronograph movement produced by Landeron.
Although some sources suggest that it was produced in the 1950s, the design and appearances are more reminiscent of the 1920s or 1930s.Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.