The Seiko 6600-7970 watch movement features a pointed balance staff bearing in white jewels and was initially manufactured by Durowe. It incorporates an electromechanically controlled balance motor and offers a sweep second function. The movement enables the day to be set by +/-24 hours and includes a quickset feature for adjusting the date. Furthermore, it includes a hack feature. The Seiko 6600-7970 movement was commonly used around the period of 1970.