The Eterna 1050L watch movement is a manual wind movement with a sweep seconds function. It features shock protection and a pin lever escapement. Additionally, it includes a calendar function and was commonly used during the period around 1975. The available sources regarding the correlations between calibre designations and features are incomplete and thus not very reliable, although it is worth noting that all calibres are only signed with 420 or 420/425.
The Eterna 1050L features the following functions: