The Tonda PF Gregorian Annual Calendar’s 42mm case houses one of Haute Horlogerie’s most poetic complications: calibre PF339 displays retrograde date, day of the week, month and a 122-year moon phase in both hemispheres.

These astronomical and calendar functions complement he traditional display of hours, minutes and seconds, providing a wealth of information without compromising the pure aesthetic desired by the Maison for this “champion of time”