![Jaeger LeCoultre® calibre # 438 mainspring](http://perrinwatchparts.com/cdn/shop/products/LC-424770_a6873ca0-0102-4cc3-bb45-dffbe6da9af7_600x600.png?v=1697235646)
Jaeger LeCoultre® mainspring, part # 770, calibre # 438
mainspring to fit Jaeger LeCoultre® calibres: 11L, 11LC, 11LCN, 11LO, 11LSC, 424, 436, 437, 438, 486, 806
* 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.