Futurematic E 501

Tonneau case with round bezelBezelThe frame surrounding the crystal at the front of a watch.; two-tone silver dial with 40-hour power reserve at 9 and small seconds at 3. Sold as “AutomaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist.” and known as Futurematic; billed as the first “100% automaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist.” watch, started by a shake. Later watches used calibres 827 (1953), 817 (1956) and 837 (1958), all with an oversized antimagnetic balance and overwind protection. US dials read “LeCoultre” because of import tariffs.