Jaeger-LeCoultre Caliber 813 – Technical Overview from Document 1135_JLC

The Jaeger-LeCoultre Caliber 813 is a meticulously engineered manual-winding mechanical movement from the mid-20th century. This caliber is celebrated for its precision, durability, and classic design, primarily powering elegant dress watches. Document 1135_JLC provides a detailed technical analysis including specifications, movement architecture, 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 40 hours

• Diameter: Approximately 23.3 mm

• Height: Approximately 3.9 mm

The slim and compact dimensions of Caliber 813 make it ideal for refined watches demanding reliable and precise timekeeping.

Movement Architecture and Features

According to document 1135_JLC, Caliber 813 includes:

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

• Two-bridge layout providing structural rigidity and facilitating maintenance

• Efficient gear train and mainspring barrel ensuring steady power delivery

• Shock protection system on the balance staff to improve resistance to shocks and impacts

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

Servicing Notes

• Lubrication: Precise application of synthetic oils to escapement pivots, pallet fork jewels, and balance staff; light grease on barrel arbor and winding components

• Regulation: Aim for amplitude between 250° and 280°, with beat error under 0.7 ms for optimal accuracy

• Small seconds mechanism: Check proper mesh and secure fitting of the fourth wheel pinion and seconds hand to avoid hand stuttering

• Keyless works: Inspect and maintain setting lever spring and sliding pinion to ensure smooth crown function during winding and setting

Applications

Caliber 813 was commonly used in:

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

• Models featuring classic small seconds displays

• Timepieces crafted in stainless steel or precious metals, typically sized between 33 and 35 mm

Conclusion

The Jaeger-LeCoultre Caliber 813, as detailed in document 1135_JLC, exemplifies the brand’s commitment to crafting precise, reliable, and elegant manual-winding movements. Its blend of mechanical excellence, slim design, and ease of servicing continues to make it a favored caliber among vintage watch collectors and professional horologists dedicated to Jaeger-LeCoultre timepieces.