![Jaeger LeCoultre® calibre # K830 mainspring](http://perrinwatchparts.com/cdn/shop/products/LC-480770_c353cd71-beab-41af-b053-952973a9705a_600x600.png?v=1697245998)
Jaeger LeCoultre® mainspring, part # 770, calibre # K830
mainspring to fit Jaeger LeCoultre® calibres: 10ROL, 480, 800, 810, 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.