The Desa 321 watch movement, which dates back to approximately 1960, is a manual wind movement that incorporates various functional features. It includes a sweep second hand as well as a date function that can be adjusted by setting the hands back and forth between 20:30 and 24 hours. In contrast to its predecessor, the Desa 321 requires a full 24-hour rotation of the hands to change the date. This modification was likely intended to simplify the design for quicker date setting, as seen in subsequent iterations of this movement.