| 摘要 |
A timepiece enables knowing the cumulative drive time indicating how long the timepiece was actually operating. The timepiece 10 has a movement 20 , hands disposed to the time display wheel train of the movement 20 for indicating the time, and a month display ring 41 and year display ring 51 that are connected to the movement 20 and count how long the drive source has been driving inside a case. The movement 20 includes a movement barrel 30 housing a spring as the power source, a time display wheel train linked to rotation of the movement barrel 30 , and a cumulative drive time display mechanism that operates in conjunction with rotation of and transfers torque from the movement barrel 30 . The case includes at least a crystal, a casing 11 , and a back cover 12 . Part of the back cover 12 is transparent to enable viewing the month display ring 41 and year display ring 51.
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