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You are here: Home / Movements / Landeron 47

Landeron 47

Last Update: April 12, 2022

Brand:Landeron
Family:
Landeron 48 Family
Height:6.22 mm
Jewels:17
Reserve: hours
Frequency:18,000 A/h
Winding:Hand winding
Diameter:31 mm (13.75 ligne)
 Early Cal. 47 Complications:3-Button Chronograph, Cam Switching Chronograph, Chronograph, Oscillating Pinion 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
Hand-Winding
Clockwise Balance Cock
Screwed Balance
Indexed Regulator
Balance
Balance at 12:00
Production: 1937 – 
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Cal. 47 was a groundbreaking chronograph movement, the first cam-actuated chronograph on its introduction in 1937. It used three buttons (start, stop, reset in crown) unlike most other movements and was soon replaced by the two-button Cal. 48 family. It was slowly modified into the two-pusher Cal. 48, with many modified parts being added over time.

The axis of the subdials is not perfectly aligned with the crown stem, and the minute counter at 3:00 is slightly (0.05 mm) closer to the center than the running small seconds. This was carried over from previous Landeron chronograph movements and gives them an unusual look. Like all movements in the family it uses Heuer-style oscillating pinion rather than a traditional horizontal clutch to activate the chronograph function.

Early Cal. 47
Later Cal. 47
Early Cal. 48

The basic ebauche was created by Charles Hahn & Cie., part of Ebauches SA, with chronograph components supplied by Dèpraz.

Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.

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