Annual calendar mechanism for clockwork movement

An annual calendar mechanism for a timepiece including a date-disc provided with a first inner toothing including thirty one teeth and on which are marked thirty one figures each corresponding to an indication of a day of the month, said indications appearing successively through a window arranged in a dial, and a date drive wheel and pinion, said wheel and pinion including a finger capable of driving said date-disc through one step once a day via one of the teeth of the inner toothing to control the date display, wherein the date-disc includes a second inner toothing provided for driving, via a gear train, at the end of each month a month-cam carrying at least five teeth or hollows corresponding to the months of less than thirty one days, each of these teeth being arranged to be situated, at the end of the months of less than thirty one days, on the path of the beak of a lever and wherein said lever carries a correction drive wheel and pinion fitted with a correction finger capable of co-operating with the first or second toothing at the end of the aforecited months to drive the date-disc through one additional step at the end of said months when the lever has pivoted following the passage of its beak over a tooth of the month-cam.