The Unitas 259 watch movement was introduced during the period of 1972-1975. It features the trade marks Astrolon and Sytal, and was initially showcased as movements submerged in water. The movement is predominantly constructed using self-lubricating plastic materials. Notable functions include manual winding, sweep seconds, and a calendar with day set by changing 23:15-0:45h, and date set by changing 23-24h. The Unitas 259 watch movement is renowned for its plastic composition and ability to achieve a sweep seconds motion.