Patent ID: 7835229

Claim:
A date mechanism for a timepiece, including: at least first and second date rings, rotatably mounted relative to each other, said first and second date rings ( 2 , 3 ) having one surface provided with successive date markings, the first date ring having a display window, arranged between two successive markings, the first date ring being superposed on the second date ring, each of said first and second date rings having teeth distributed on the periphery thereof, each tooth being associated with a respective marking or with the display window; a control wheel for the first and second date rings; wherein the control wheel is provided with first and second superposed tiers of toothings, each toothing tier including one portion provided with adjacent teeth and one tooth-free portion, the tooth-free portion of one tier being arranged vertical to the toothed portion of the other tier, one tooth of the first tier being superposed on one tooth of the second tier, the teeth of the first and second tiers of the control wheel respectively driving the first and second date rings via the teeth thereof.