Patent ID: 7180829

Claim:
A timepiece equipped with a calendar mechanism including two date indicators, the timepiece comprising: a first date indicator for displaying a units numeral of a date; a first date jumper for setting a position of the first date indicator in a rotation direction; a second date indicator for displaying a tens numeral of the date; a second date jumper for setting a position of the second date indicator in a rotation direction; and a date intermediate wheel for undergoing rotation in accordance with rotation of the first date indicator to thereby rotate the second date indicator; wherein the first date indicator has a first date character display surface including 31 numerals “1”, “1”, “2”, “3”, “4”, “5”, “6”, “7”, “8”, “9”, “0”, “1”, “2”, “3”, “4”, “5”, “6”, “7”, “8”, “9”, “0”, “1”, “2”, “3”, “4”, “5”, “6”, “7”, “8”, “9”, and “0”; wherein the second date indicator has a first date character display surface including four numerals “1”, “2”, “3”, and “0”, or a second date character display surface including three numerals “1”, “2”, and “3”; wherein the first date indicator has 31 first date indicator tooth portions formed as internal teeth and 4 calendar shift teeth formed as internal teeth, the first date indicator tooth portions being equally spaced apart at the same angle, the calendar shift teeth comprising a first calendar shift tooth, a second calendar shift tooth formed with a spacing of (360×2/31) degrees in a first direction relative to the first calendar shift tooth, a third calendar shift tooth formed with a spacing of (360×10/31) degrees in the first direction relative to the second calendar shift tooth, and a fourth calendar shift tooth formed with a spacing of (360×9/31) degrees in a second direction opposite to the first direction relative to the first calendar shift tooth; and wherein the date intermediate wheel undergoes rotation in accordance with rotation of the calendar shift teeth of the first date indicator to thereby rotate the second date indicator.