Patek Philippe Perpetual Calendar Moonphase Chronograph SpecialPricing the Rolex GMT Master became

the Rolex GMT Master became a runaway--or shall we say

wasn't doing so well at the end of the 1960s

well-proportioned

The Mark IV is a joy to wear

Hamilton was losing footing on its own turf

Patek Philippe Perpetual Calendar Moonphase Chronograph SpecialPricing the Rolex GMT Master becameA 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?