The A. Schild 668 is a manual wind watch movement with a period of use from 1966 to 1969. It features a Breguet hairspring, adjustment screws on balance spokes, Girocap combined settings for the escapement wheel, and a gold lever. This movement is designed without a second hand, making it suitable for slim dress watches. Additionally, it includes functions such as an adjustable stud holder and Incabloc shock protection.