Jaeger-LeCoultre Caliber 218 – Technical Overview from Document 1087_JLC

The Jaeger-LeCoultre Caliber 218 is a classic manual-winding mechanical movement, widely respected for its precision, reliability, and traditional craftsmanship. It has been utilized in a variety of Jaeger-LeCoultre’s iconic timepieces, particularly during the mid-20th century. Document 1087_JLC offers an extensive technical breakdown, including component details, assembly instructions, and maintenance guidelines.

Technical Specifications

• Type: Manual-winding

• Functions: Hours, minutes, small seconds

• Jewels: Typically 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 218 balances a robust build with a slim profile, making it suitable for elegant wristwatches that demand both durability and refinement.

Movement Features and Architecture

Based on document 1087_JLC, Caliber 218 includes:

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

• Two-bridge layout, providing structural rigidity and simplifying servicing

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

• Incabloc shock protection on the balance wheel

• Manual winding and setting system with smooth crown operation

The design reflects Jaeger-LeCoultre’s focus on functional precision and long-term reliability.

Servicing Notes

• Lubrication: Use fine synthetic oils on pivots and escapement jewels; apply grease sparingly on barrel arbor and winding wheels

• Regulation: Aim for amplitude of 250°–280° and beat error under 0.8 ms for optimal accuracy

• Small seconds: Verify smooth rotation and secure fitting of the fourth wheel pinion and seconds hand

• Keyless works: Inspect setting lever, yoke, and sliding pinion for wear to maintain smooth time setting and winding

Applications

Caliber 218 was commonly employed in:

• Jaeger-LeCoultre dress watches from the 1940s through the 1960s

• Models emphasizing classic aesthetics with small seconds complication

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

• Watches appreciated by collectors for their vintage charm and mechanical robustness

Conclusion

The Jaeger-LeCoultre Caliber 218, as detailed in document 1087_JLC, is a distinguished manual-winding movement that represents traditional Swiss watchmaking at its finest. Its blend of precision engineering, elegant design, and serviceability has made it a durable favorite in the vintage watch market. The caliber continues to be respected for its mechanical reliability and timeless aesthetic in the world of Jaeger-LeCoultre horology.