Longines L888.4

Longines caliber L888.4 is an automatic movement based on the ETA A31.L11, exclusive to Longines despite its shared architecture. It features 21 jewels, a ball-bearing rotor, and Nivashock shock protection, with a power reserve of up to 72 hours. The movement's defining characteristic is its silicon balance-spring, which provides antimagnetic properties and contributes to its COSC chronometer certification.