US Patent 7254094 Timepiece with calendar mechanism containing 2 date indicators

To provide a structure capable of performing a correction which surely and easily turns a date display back by rotating a 1st date indicator and a 2nd date indicator in both positive and reverse directions. A timepiece with a calendar mechanism possesses a 1st date indicator, a 2nd date indicator, and a date intermediate wheel which rotates the 2nd date indicator by a rotation of the 1st date indicator. Calendar shift teeth of the 1st date indicator possess a positive rotation unlocking part and a reverse rotation unlocking part. When a rotation center of the 2nd date indicator is defined as “CDA”, a rotation center of the date intermediate wheel as “CMD” and a straight line passing through the “CDA” and the “CMD” as “LDM”, a disposition of the calendar shift teeth before the 1st date indicator is unlocked in a 1st direction and a disposition of the calendar shift teeth under a state that the 1st date indicator has been finished to be unlocked in the 1st direction are axisymmertic with the straight line “LDM” being made a reference line.