Jaeger-LeCoultre Caliber 609 – Technical Overview from Document 1125_JLC

The Jaeger-LeCoultre Caliber 609 is a classic manual-winding mechanical movement widely respected for its reliability and refined construction. Document 1125_JLC offers an in-depth technical description of this caliber, including detailed specifications, movement architecture, and maintenance guidelines.

Technical Specifications

• Type: Manual-winding

• Functions: Hours, minutes, small seconds

• Jewels: 17

• Frequency: 18,000 vibrations per hour (2.5 Hz)

• Power Reserve: Approximately 40 hours

• Diameter: Approximately 27.0 mm

• Height: Approximately 3.5 mm

The caliber is known for its robust engineering and smooth operation, making it suitable for high-quality dress watches.

Movement Features

Based on document 1125_JLC, Caliber 609 features:

• Small seconds subdial at 6 o’clock

• Two-bridge layout facilitating structural stability and servicing ease

• Reliable gear train and mainspring barrel designed for consistent power delivery

• Shock protection on the balance staff to improve durability

• Manual winding and setting system optimized for user comfort and longevity

Servicing Notes

• Lubrication: Precision application of oils to escape wheel pivots, pallet stones, and balance staff jewels; light grease on barrel arbor and winding gears

• Regulation: Achieve amplitude between 250° and 280° and beat error under 0.8 ms

• Small seconds mechanism: Confirm smooth mesh and correct seating of the fourth wheel pinion and seconds hand

• Keyless works: Regular inspection to ensure smooth crown winding and setting functions

Applications

Caliber 609 was commonly used in:

• Jaeger-LeCoultre dress watches produced in the mid-20th century

• Models with elegant small seconds displays and slim profiles

• Timepieces made from stainless steel or precious metals, typically sized between 34 and 36 mm

Conclusion

The Jaeger-LeCoultre Caliber 609, as outlined in document 1125_JLC, represents a fine example of traditional manual-winding movement engineering. Its precise construction, reliable performance, and ease of maintenance have made it a favorite among vintage watch collectors and professional watchmakers. The caliber stands as a testament to Jaeger-LeCoultre’s commitment to quality and mechanical excellence.