Perpetual Calendar Mechanical Watch. The 5550 of 2011 again sees patek hiding its high technology behind traditional dials, perhaps more so than with any other watch. What is a perpetual calendar watch?
It is a circular perpetual calendar watch, and it is. With its remarkable proportions, this watch offers a clear reading of the perpetual calendar, featuring the month, date, day of the week and year, as well as its power reserve and.