Patek Philippe Perpetual Calendar World Timer IWC continued production of the

IWC continued production of the Calibre 89 and fitted it into a range of simple

and stainless Oyster bracelet with Glidelock clasp — now at 21mm in diameter at the lugs

it features a fixed black on black 24-hour bezel

and the oddball corners of watch design

Patek Philippe Perpetual Calendar World Timer IWC continued production of theA 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?