Olympia Orient Weekly Swimmer 21 Day Date Tobiuo (Flying Fish) Hand-winding Case width: Approximately 3.85cm including the crown Wrist size: Free size The day-date function does not have a quick-change feature, but you can change the date and day by turning the time forward to around 4 o'clock and then back to around 8 o'clock repeatedly. If you only want to change the day, you can change it by turning the time backward. Please check the photos for minor scratches, etc. Watch works without problems. #Vintage #Antique