Jaeger-LeCoultre Calibers 605 and 606 – Technical Overview from Document 1124_JLC (Pages 605–606)

The Jaeger-LeCoultre Calibers 605 and 606 are part of the brand’s distinguished range of manual-winding mechanical movements, developed in the mid-20th century. Document 1124_JLC, pages 605–606, provides detailed technical insights into these calibers, focusing on their construction, key features, and servicing guidelines. Both calibers are closely related, with subtle differences tailored to specific watch models and functions.

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 mm

• Height: Approximately 3.8 mm

Caliber 605

• Features a small seconds subdial, usually at 6 o’clock

• Robust gear train optimized for stable power transmission

• Traditional two-bridge design allowing ease of servicing

• Shock protection on the balance wheel

• Reliable keyless works ensuring smooth winding and time setting

Caliber 606

• Similar to Caliber 605 in most aspects

• May include slight modifications in bridge layout or component finishes

• Designed for specific case sizes or stylistic preferences

• Also features a small seconds complication

• Shares the same performance and durability characteristics

Servicing Notes

• Both calibers require precise lubrication at escape wheel pivots, balance staff, and gear train jewels

• Regular inspection and adjustment of the small seconds mechanism ensure smooth operation without stutter

• The keyless works must be checked for wear to maintain optimal crown function

• Regulation involves maintaining amplitude between 250° and 280° and minimizing beat error below 1 ms

Applications

Calibers 605 and 606 were utilized in:

• Mid-century Jaeger-LeCoultre dress watches emphasizing classic aesthetics

• Models often housed in stainless steel or precious metal cases, ranging between 34 and 37 mm

• Timepieces prized by collectors for their mechanical reliability and timeless design

Conclusion

Pages 605–606 of document 1124_JLC provide essential technical information on the Jaeger-LeCoultre Calibers 605 and 606, highlighting their similarities and subtle distinctions. These calibers exemplify JLC’s dedication to producing precise, durable, and elegant manual-winding movements that have stood the test of time. They remain significant components in the heritage of Jaeger-LeCoultre’s watchmaking legacy.