Hamilton H-23

The H-23 is a manual-winding movement manufactured by Hamilton, based on the ETA C07 Powermatic 80. It features a power reserve indicator at 9:00, displaying remaining energy in the mainspring via a differential mechanism. The movement incorporates a Nivachron hairspring and Nivashock shock protection, with a slipping spring inside the barrel that prevents overwinding and allows automatic resynchronization after strong impacts. It is currently in production.