Jaeger LeCoultre® calibre # K831 balance with flat hairspring, regulated

Jaeger LeCoultre® balance with flat hairspring, regulated, part # 721, calibre # K831

balance with flat hairspring, regulated to fit Jaeger LeCoultre® calibres: 10ROL, 480, 800, K830, K831

*Perrin Supply Ltd is independent of and not affiliated with or sponsored by Jaeger LeCoultre®. Jaeger LeCoultre® warranty does not apply to parts supplied byPerrin Supply Ltd. Using generic parts may devalue your watch.