Patent ID: 7864634

Claim:
A timepiece with a calendar function, comprising: a dial having a tens digit display aperture for displaying tens digit of date and a ones digit display aperture for displaying ones digit of the date; and a calendar mechanism that displays the date by presenting specific numerals through the dial, the calendar mechanism including a ones display wheel having ones markers with which the ones digit is displayed through the ones digit display aperture, a tens display wheel having tens markers with which the tens digit is displayed through the tens digit display aperture, a ones drive mechanism that drives the ones display wheel, and a tens drive mechanism that drives the tens display wheel, the tens markers including five markers including normal tens markers and two-digit display markers, the normal tens markers being numerals 0, 1, and 2 that display only the tens digit of the date in the tens digit display aperture, and the two-digit display markers being numerals 30 and 31 that display the tens digit of the date in the tens digit display aperture and the ones digit of the date in the ones digit display aperture, the ones display wheel and the tens display wheel being not concentric.