The Eterna 1450U is a mechanical watch movement that features an ingenious design in which a single part replaces the setting-lever spring, yoke, and yoke spring. Not much is known about the differences between the Eterna 1450U and the Alpina 762, or if there were two separate Alpina calibres within the Alpina-Gruen Guild. The earlier Alpina 762 appears to have been finished by Gruen, while the later Eterna 1450U was directly purchased from Universal. However, the movement registers and staff lists only mention the base calibre Universal 259, making further investigations challenging. The Eterna 1450U is a manual wind movement with sub-second function, and it was commonly used around 1945.