![Jaeger LeCoultre® calibre # 911 hairspring fastener](http://perrinwatchparts.com/cdn/shop/products/LC-910378_e3ad0bfc-e50a-47b6-8094-bbaa53dbd1c9_600x600.png?v=1697249820)
Jaeger LeCoultre® hairspring fastener, part # 378, calibre # 911
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.