![Jaeger LeCoultre® calibre # 910 hairspring fastener](http://perrinwatchparts.com/cdn/shop/products/LC-910378_600x600.png?v=1697249525)
Jaeger LeCoultre® hairspring fastener, part # 378, calibre # 910
hairspring fastener to fit Jaeger LeCoultre® calibres: 910, 911
* 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.