Jaeger-LeCoultre Caliber 630 – Technical Overview from Document 1131_JLC

The Jaeger-LeCoultre Caliber 630 is a refined manual-winding mechanical movement, well-regarded for its precision, durability, and classic design. Document 1131_JLC provides a comprehensive technical description, covering the movement’s architecture, key features, and servicing guidelines.

Technical Specifications

• Type: Manual-winding

• Functions: Hours, minutes, small seconds

• Jewels: 17

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

• Power Reserve: Approximately 42 hours

• Diameter: Approximately 27.0 mm

• Height: Approximately 3.5 mm

The caliber’s design balances slimness with robust mechanical performance, suitable for elegant dress watches.

Movement Architecture and Features

According to document 1131_JLC, Caliber 630 includes:

• Small seconds subdial located at 6 o’clock, powered by the fourth wheel and pinion

• Two-bridge layout providing stability and ease of servicing

• Efficient gear train and barrel system for consistent power delivery

• Shock protection system on the balance staff to protect against shocks

• Smooth manual winding and setting mechanisms, engineered for durability and user comfort

Servicing Notes

• Lubrication: Apply fine synthetic oils to escape wheel pivots, pallet fork jewels, and balance staff; use light grease on barrel arbor and winding components

• Regulation: Target amplitude between 260° and 280°, with beat error under 0.7 ms

• Small seconds mechanism: Ensure proper engagement and smooth rotation of the fourth wheel pinion and seconds hand

• Keyless works: Inspect and maintain setting lever spring and sliding pinion to guarantee smooth winding and setting functions

Applications

Caliber 630 was typically installed in:

• Jaeger-LeCoultre manual-winding dress watches produced during the mid-20th century

• Models featuring small seconds and classic dial layouts

• Watches in stainless steel or precious metals, with case sizes commonly between 34 and 36 mm

Conclusion

The Jaeger-LeCoultre Caliber 630, as detailed in document 1131_JLC, exemplifies traditional Swiss watchmaking craftsmanship with a reliable, precise, and slim manual-winding movement. Its combination of mechanical excellence and elegant design continues to make it a sought-after caliber among collectors and watchmakers dedicated to vintage JLC timepieces.