The invention consists of a mechanism for mechanical perpetual calendar with month view, comprising: a. a matrix of dates (2) of seven rows and four columns consisting of a dial (1) by group of seven first twenty-eight calendars of each month in ascending order, and a fifth column with three openings (3, 4, 5) corresponding to twenty-nine variables calendars, thirty and thirty-one; b. display means varying calendars a given month showing in these locations (3, 4, 5) either none, or one, two or three or last calendars of this month; and c. a control mechanism for varying calendars display means.
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