Upgrade your timepiece with the JAEGER LECOULTRE 240 Swiss Made Replacement Mainspring, designed specifically for the model 240. Crafted with precision in Switzerland, this mainspring ensures your watch operates with the impeccable accuracy that Jaeger-LeCoultre is renowned for. Whether you're a professional watchmaker or a collector looking to maintain your watch's performance, this genuine replacement part is essential. The mainspring is a vital component that provides the power necessary for your watch to function flawlessly, keeping time with Swiss-engineered reliability.