The Hermann Becker 120 watch movement, widely comparable to the Seiko 6602B, is a manual-wind movement with a stem mechanism lacking a setting-lever spring. It incorporates Seiko-Diafix combined settings for the escapement wheel. It features additional functions including a sweep second hand and a date function that can be set by changing the time from 21:30 to 24h. This movement was predominantly used around the year 1966.