The Zenith 133 is a mechanical watch movement with a period of use starting in 1969. It features diafix combined settings for the escape wheel and third wheel, providing stability and accuracy. The winding gear is integrated into the movement, eliminating the need for attachment to a manual-wind calibre. This design allows for a rugged movement with a relatively large balance and low profile. The movement incorporates several functions, including automatic winding, a sweep seconds hand, and a hack feature. It also includes an adjustable stud holder.