Thank you for viewing. This is an auction for a TAG Heuer, old logo HEUER stopwatch. This is a rare and valuable stopwatch. It functions normally. It is a manual-winding type. Wind it by turning the crown at the zero position clockwise, and then push the button to start. Push the button a second time to stop. To reset to zero, press the button located at the 10:30 position. Everything functions perfectly. Trackmate stopwatch, approximately 5cm in diameter, REF. 363. - Brand: HEUER - Model: Trackmate - Reference Number: REF. 363 - Size: Approximately 5cm in diameter Thank you for viewing.