The Dugena 3803 is a manual-wind chronograph watch movement used during the period of 1937-1970. With over 3.5 million units produced, it featured various interchangeable chrono mechanisms and occasionally incorporated parts from different calibres. It offered a 60-second subdial, a 30 or 45-minute stopwatch function, a sub second hand, and a date complication positioned at 6 o'clock, adjustable within a +/-24-hour range.