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You are here: Home / Movements / Landeron 81

Landeron 81

Last Update: April 12, 2022

Brand:Landeron
Family:
Landeron 48 Family
Height:7.42 mm
Jewels:17
Reserve: hours
Frequency:18,000 A/h
Winding:Hand winding
Diameter:31 mm (13.75 ligne)
  Complications:2-Button, Cam Switching Chronograph, Chronograph, Date, Date by Pointer, Day, Horizontal Clutch Chronograph, Month, Moon Phase
Hands:30 Minute Chronograph Hand at 3:00, Central 60 Second Chronograph Hand, Central Date Pointer, Central Hour Hand, Central Minute Hand, Day Window at 11:30, Month Window at 12:30, Moon Phase Wheel at 6:00, Small Seconds Hand at 9:00
Distinguishing Technical Characteristics
Hand-Winding
Clockwise Balance Cock
Screwed Balance
Indexed Regulator
Balance
Balance at 12:00
Production:  – 
1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s

Cal. 81 is a cam-switching chronograph movement with full calendar and moon phase produced by Landeron (Charles Hahn & Cie.) Based on the simple Cal. 51 and full calendar Cal. 80, Cal. 81 was the first of Landeron’s mainstream Cal. 48 family to feature a moon phase complication. Cal. 81 is very similar to the later Cal. 181.

Cal. 186 function diagram

Most of the Cal. 48 movements feature a date pointer at 6:00, but this dial position was taken by the moon phase indicator. Rather than having a co-axial date subdial, Cal. 81 and variants use a central date pointer, the only such indication in this family of movements.

The date complication is adjusted using pushers inset into the case:

  • 2:30 – Month
  • 8:00 – Moon phase
  • 9:00 – Date pointer
  • 10:00 – Day
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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