Citizen 8826

The world's thinnest light-powered movement at just 1mm thick, enabling total watch thickness of only 2.98mm. Every component was redesigned for minimal thickness: the motor coil is less than 1mm and set directly into the mainplate, the sapphire dial is 0.15mm thick, and a specially developed 0.87mm lithium ion cell was created with Hitachi Maxell. Features ring-shaped solar cells placed in the same plane as the gear train. Due to extremely tight tolerances, these movements are hand-assembled. Power reserve of 12 months in darkness. Accuracy ±15 seconds/month.