Patent ID: 8605553

Claim:
An annual calendar device for a timepiece including a date ring bearing thirty-one numbers, which appear in succession through an aperture, said ring carrying thirty-one inner teeth located on a first level, a drive wheel for the date ring completing one revolution in twenty-four hours, and a mechanism carried by said drive wheel and rotating therewith, wherein said mechanism has a first finger driving a tooth of the date ring through one step, at the end of each day, wherein said mechanism has a second finger driving the date ring through an additional step at the end of the last day of a month of less than thirty-one days, said second finger being activated, for the purpose of said driving, by a toothing, located on a second level of the date ring, said second finger being connected to said toothing by a gear train, wherein said gear train comprises said mechanism including said first and second fingers, a month cam with five projecting portions activating second finger via said mechanism, a month star wheel fixed said cam and an intermediate transmission wheel meshing with said star wheel, and wherein said intermediate wheel is in mesh, at the end of each month, with said toothing.