Perpetual Calendar
Roger Dubuis’ various interpretations of the calendar are as creative as they are functional. Take the example of the RD821J calibre, a latest generation self-winding mechanical movement serving to display the day of the week and the month in two side-by-side apertures, along with the date, the moon phase and the leap year. And all this without any need for adjustment until the year 2100, regardless of the number of days in the month.
