|Diameter:||39.75 mm (17.675 ligne)|
|Complications:||2-Button, 6-Column Chronograph, Chronograph, Column Wheel Chronograph, Split Seconds Chronograph|
|Hands:||30 Minute Chronograph Hand at 3:00, Central Hour Hand, Central Minute Hand, Central Split Second Chronograph Hand, Small Seconds Hand at 9:00|
|Distinguishing Technical Characteristics|
Clockwise Balance Cock
|Production: 1910 –|
Valjoux Cal. 20 is a pocket watch column wheel chronograph movement. Introduced around 1910, it was produced at least through the 1920s. It featured a six-column wheel to control the chronograph function. The chronograph used a central seconds hand with split seconds and a 30 minute counter. It was a dual-pusher design.
This is a “lépine” pocketwatch movement, with the small seconds placed on the same axis as the winding crown. In a pocketwatch, this would place the small seconds at 6:00 with the winding crown at 12:00. The image above would show its placement in a wristwatch, with the winding crown at 3:00 and the small seconds at 9:00.Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.