The Elgin 685 watch movement is an open face calibre with a stop function that utilizes a pillar wheel. It is likely manufactured by AS, but it is also listed under other names such as Elgin 685, Heuer 960-987, and Leonidas 943. These variations are mostly identical, occasionally featuring minor differences, and sometimes being incorrectly sized at 19'''. In addition, the movement offers various functions including a timer with a 60s (0.2s) capacity and a 30-minute interval controlled by the pillar wheel. There is also an optional timer setting of 30s (0.1s) and 15 minutes. Moreover, the movement is stem wind and features a sweep second hand. It was commonly employed during the period around 1925.