Patek Philippe Split Seconds Perpetual Calendar Patina the Glomar Challenger sailed down

the Glomar Challenger sailed down the Sabine River to the Gulf of Mexico for testing by the Deep Sea Drilling Project

this Cartier includes its original red presentation box

all through the magic of mechanical watchmaking

But among the rarest of these are the Diver 100 models

Patek Philippe Split Seconds Perpetual Calendar Patina the Glomar Challenger sailed downA perpetual calendar is like a small computer on your wrist. Think of it this way: Imagine a watch that keeps track of not only the time, but also the date, the day of the week, and the month, and also tells you whether its a leap year or not, and what the current phase of the moon is. Oh, and one more thing imagine it does all of this mechanically, using springs and gears, and that you only have to adjust it once every century or so. Crazy, right?