Sinn Spezialuhren SW300

The SW300 is an automatic movement manufactured by Sinn Spezialuhren. It is a modified version of the Sellita SW300-1, serving as a premium alternative to the base SW200-1 caliber. Sinn introduced the movement in 2018, and it remains in production, appearing primarily in the brand's higher-end tool watches. Unlike Sinn's in-house calibers, the SW300 is sourced externally but receives Sinn-specific modifications for enhanced durability and accuracy.