Jaeger-LeCoultre Caliber 430 – Technical Overview from Document 1103_JLC

The Jaeger-LeCoultre Caliber 430 is a highly regarded manual-winding mechanical movement, distinguished by its precision, slim profile, and elegant design. Document 1103_JLC provides detailed technical information, including the movement’s architecture, specifications, and servicing recommendations, making it a vital 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 42 hours

• Diameter: Approximately 28.3 mm

• Height: Approximately 3.2 mm

The movement is known for its slimness, making it well-suited for dress watches requiring both style and mechanical reliability.

Movement Architecture and Features

According to document 1103_JLC, Caliber 430 includes:

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

• Slim and robust gear train layout, optimized for energy efficiency and durability

• Shock protection on the balance assembly, enhancing resistance to impacts

• Smooth manual winding and setting mechanism, engineered for reliability and ease of use

The caliber balances fine finishing with practical engineering for consistent performance.

Servicing Notes

• Lubrication: Use synthetic oils for escapement pivots, pallet jewels, and balance staff; apply light grease to the barrel arbor and winding gears

• Regulation: Target amplitude between 250° and 280° with beat error kept under 1 ms

• Small seconds mechanism: Ensure secure seating and proper mesh of the fourth wheel and seconds pinion to prevent stuttering or excessive play

• Keyless works: Regularly inspect the setting lever spring and sliding pinion to maintain smooth crown operation

Applications

Caliber 430 was commonly used in:

• Jaeger-LeCoultre dress watches from the mid-20th century

• Models featuring elegant small seconds displays and thin case designs

• Timepieces crafted in precious metals or stainless steel, often ranging from 34 to 36 mm in diameter

• Watches appreciated by collectors for their refined craftsmanship and dependable mechanics

Conclusion

The Jaeger-LeCoultre Caliber 430, as detailed in document 1103_JLC, exemplifies classic Swiss manual-winding movement design, combining slim dimensions with reliable and precise timekeeping. Its blend of traditional aesthetics and mechanical excellence continues to make it a favorite among vintage watch enthusiasts and horologists, reflecting Jaeger-LeCoultre’s commitment to quality and innovation.