a bidirectional dive bezel with an aluminum insert
releasing their first one in 1919
dates to circa 1993 and is a fantastic example of an increasingly-desirable Reference
these watches have become incredibly desirable on the market today
it certainly puzzles those of us with a horological bent
IWC Perpetual Calendar Chronograph patek philippe complications a bidirectional dive bezel withA 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 it's 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?