![Jaeger LeCoultre® calibre # 427 mainspring](http://perrinwatchparts.com/cdn/shop/products/LC-427770_ced2455e-2458-45dc-8d39-65ecd7e24124_600x600.png?v=1697234959)
Jaeger LeCoultre® mainspring, part # 770, calibre # 427
mainspring to fit Jaeger LeCoultre® calibres: 8RF, 8RFO, 402, 427
* 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.