6M91

Very rare model in superb condition.

• Dual time function
• Dual time alarm (Main time ± 23 hours)
• Main time alarm (24-hour indication system)
• Automatic calendar (Year, month and date up to the year 2099)
• Hands 0-reset adjustment function (including the date position adjustment)
• Alarm test system
• Demonstration movement of the hands and date
• Confirmation sound for watch operation
• Electronic circuit reset switch