Jaeger LeCoultre® calibre # 10ROL balance with flat hairspring, regulated

Jaeger LeCoultre® balance with flat hairspring, regulated, part # 721, calibre # 10ROL

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

* H. & W. Perrin Company Limited is independent of and not affiliated with or sponsored by Jaeger LeCoultre®. Jaeger LeCoultre® warranty does not apply to parts supplied by H. & W. Perrin Company Limited. Using generic parts may devalue your watch.