The ETA 2370 is an open face calibre watch movement that features a stop function with a pillar wheel. It offers a timer function with a range of 60 seconds (0.2 seconds) and 30 minutes. Additionally, there is an optional version that provides a timer function with a range of 60 seconds (0.1 seconds) and 30 minutes. The movement is likely manufactured by Valjoux, although it is often listed in catalogs as Heuer Sport 19'''F. The ETA 2370 is stem wind and includes a sweep second hand. It was in use around 1945.