![Jaeger LeCoultre® calibre # K813 balance cock screw](http://perrinwatchparts.com/cdn/shop/products/LC-8125121_8c4f0bf0-6945-48bd-8873-4fee41908809_600x600.png?v=1697243800)
Jaeger LeCoultre® balance cock screw, part # 5121, calibre # K813
balance cock screw to fit Jaeger LeCoultre® calibres: 812, K812, P812, 813, K813, P813
* 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.