Calendar Mechanism For Displaying The Date And The Day Of The Week In One Timepiece

A calendar mechanism for displaying the date and the day of the week in a timepiece, including a date indicator in the form of an internally toothed crown, means for driving said date indicator including a first drive wheel having an external toothing so as to be able to be driven about an axis of rotation by a wheel set secured to an hour wheel of said timepiece and said toothing including a prominent tooth, longer than the others, which abuts against a tooth of the inner toothing of the date indicator to move it forward one day in a time interval located around a determined time of the day, said mechanism also including a day of the week indicator, means for driving said day of the week indicator to move it forward one day during said time interval and means for positioning said indicators and said mechanism being wherein said means for driving the day of the week indicator include a second drive wheel fitted with an external toothing, superposed and coaxial to the first drive wheel and wherein said first and second drive wheels have the same diameter and the same even number of teeth and are driven by the same wheel set secured to said hour wheel.