The Otero 70 is an open face calibre with a stop function controlled by a pillar wheel. It features a barrel from Leonidas and is likely manufactured by AS. It is also listed as Heuer 943, Heuer 960-987, and Otero 70, with slight variations in some instances. The movement has a diameter of 19''' and offers various functions such as a timer with options for 60s (0.2s) and 30min, as well as an option for 30s (0.1s) and 15min. It is a stem-winding movement with a sweep second hand and was commonly used around 1925.