![Jaeger LeCoultre® calibre # 490 balance cock screw](http://perrinwatchparts.com/cdn/shop/products/LC-4605121_dc518ecb-7eb9-4084-bf2a-0aae66d10031_600x600.png?v=1697240931)
Jaeger LeCoultre® balance cock screw, part # 5121, calibre # 490
balance cock screw to fit Jaeger LeCoultre® calibres: 9OL, 9OLN, 460, 490, K490, 491
* 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.