The Eterna 1321T watch movement, utilized around 1958, incorporates a unique feature where the winding gear is integrated within the movement itself rather than being attached to a manual-wind calibre. This design choice allows for an acceptable height, despite the moderately high base movement. Additionally, the movement employs a detached manual wind mechanism and a distinctive magnet in a bushing instead of a friction spring to ensure seamless motion of the indirect sweep second. Noteworthy functions of this movement include automatic winding, sweep second, date adjustment accomplished by altering 22-24 hours, and a hack feature.