The Seiko 2949-539A watch movement, manufactured around 1970, features a pointed balance staff supported by white jewels. The balance is equipped with a diode in parallel to the inductor, providing stabilization of the amplitude and enhancing durability by extinguishing sparks at the contact. This electromechanically controlled movement also includes functions such as a sweep second hand, day adjustment with a range of +/-24 hours, quickset date feature, and a hack feature.