Jaeger-LeCoultre Calibers 800 to 810 – Technical Overview from Document 1133_JLC

The Jaeger-LeCoultre Calibers 800 through 810 represent a versatile family of manual-winding mechanical movements, produced primarily during the mid-20th century. These calibers exhibit a range of functions and configurations, catering to various model requirements including different seconds displays and added complications. Document 1133_JLC provides a detailed technical examination spanning pages 800 to 810, encompassing construction, component layout, and servicing guidance.

General Technical Specifications

• Type: Manual-winding

• Functions: Hours, minutes, with variations including small seconds, central seconds, and calendar functions

• Jewels: Typically between 17 and 19 depending on variant

• Frequency: 21,600 vibrations per hour (3 Hz)

• Power Reserve: Approximately 40–42 hours

• Diameter: Ranges between approximately 23.3 mm to 27.0 mm depending on the caliber

• Height: Typically between 3.5 mm and 4.5 mm depending on complications

Caliber Variations and Features

• Caliber 800: Basic time-only movement, typically featuring small seconds at 6 o’clock

• Caliber 801: Similar to 800 but with central seconds display

• Caliber 802 and 803: Include calendar mechanisms, usually date complications

• Caliber 804 to 810: Further refinements and variations including improved shock protection, finishing, and possibly slight dimensional changes to accommodate specific cases

Each caliber builds on a common architectural foundation, adapting components to suit different dial layouts and functionalities.

Movement Architecture

• The movements feature a robust gear train and barrel assembly for consistent power delivery.

• Variations in seconds display affect the design of the fourth wheel and motion works.

• Calendar-equipped calibers incorporate a semi-instantaneous date change mechanism, with a date-driving finger and jumper spring ensuring accurate daily advancement.

• Keyless works (stem, setting lever, yoke) are designed for smooth manual winding and efficient setting.

Servicing Highlights

• Lubrication: Careful application of oils and grease is critical, especially at escapement pivots, barrel arbors, and calendar components.

• Adjustment: Beat error should be kept minimal (under 0.7 ms) with an amplitude target between 250° and 280° for precise timekeeping.

• Calendar maintenance: The date jumper spring and driving finger must be clean and correctly tensioned to ensure reliable date jumps.

• Assembly: Proper gear mesh and free play must be verified to prevent wear and ensure long-term durability.

Applications

These calibers were employed across a broad range of Jaeger-LeCoultre watches, including:

• Classic dress watches with small or central seconds

• Timepieces with or without date functions

• Models in stainless steel, gold, or platinum cases, typically sized between 33 mm and 37 mm

They served both the European market and the U.S. under the LeCoultre brand.

Conclusion

Pages 800 to 810 of document 1133_JLC provide comprehensive technical data essential for understanding and servicing the Jaeger-LeCoultre Calibers 800 to 810. These calibers exemplify JLC’s expertise in creating reliable, versatile manual-winding movements suited to a variety of watch designs. Their enduring mechanical quality and adaptability continue to make them favorites among collectors and watchmakers specializing in vintage Jaeger-LeCoultre timepieces.