Automatic & retrograde annual calendar movement
TONDA ANNUAL CALENDAR SLATE
The Tonda Annual Calendar, conveys Michel Parmigiani's passion for these complications. In his honour, the manufacture has developed the calibre PF339, which features both a retrograde annual calendar and a precision moon phase. In combination, these two complications ensure the new Tonda Annual Calendar is a piece wholly devoted to astronomy, as it transcribes the rotation of the Earth in relation to both the sun and the moon.