Jaeger-LeCoultre Caliber 618 – Technical Overview from Document 1129_JLC

The Jaeger-LeCoultre Caliber 618 is a refined manual-winding mechanical movement well-regarded for its precision, robustness, and classical design. Document 1129_JLC offers detailed technical specifications, component layout, and servicing guidelines, serving as a comprehensive reference for watchmakers and collectors.

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 movement is praised for its slim profile, making it suitable for elegant dress watches emphasizing traditional mechanical craftsmanship.

Movement Architecture and Features

As detailed in document 1129_JLC, Caliber 618 includes:

• Small seconds subdial positioned at 6 o’clock, driven by the fourth wheel

• Two-bridge design enhancing rigidity and ease of maintenance

• Robust gear train and mainspring barrel optimized for consistent power transmission

• Shock protection system on the balance wheel, typically using Incabloc or similar

• Manual winding and setting system offering smooth crown operation and reliable time adjustment

Servicing Notes

• Lubrication: Application of fine synthetic oils on escape wheel pivots, pallet stones, and balance jewels; light grease on barrel arbor and winding components

• Regulation: Aim for amplitude between 250° and 280° with a beat error under 0.7 ms for accurate timekeeping

• Small seconds mechanism: Ensure proper seating and mesh of the fourth wheel and seconds pinion to avoid hand stutter or play

• Keyless works: Regular inspection and maintenance of the setting lever spring and sliding pinion to maintain smooth winding and setting

Applications

Caliber 618 was used in:

• Mid-20th century Jaeger-LeCoultre dress watches featuring classic design elements

• Timepieces crafted in stainless steel or precious metals, with case sizes around 34–36 mm

• Watches valued by collectors for their traditional aesthetics and mechanical reliability

Conclusion

The Jaeger-LeCoultre Caliber 618, as presented in document 1129_JLC, embodies the brand’s commitment to producing precise, reliable manual-winding movements with elegant design. Its balance of technical sophistication and serviceability ensures its continued appreciation among vintage watch enthusiasts and professional horologists.