The Dugena 240 watch movement, manufactured from 1937 to 1970, produced over 3.5 million units during its production period. It featured a manual-wind chronograph with a 60-second, 30/45-minute capability that was cam switched. The movement also included a sub-second function, making it suitable for chronograph purposes. It is worth noting that there were instances where different calibre parts were interchanged within series, leading to occasional variations between the 248 and 348 models, but specific differences are not known.