Patek Philippe Tonneau Perpetual Calendar Strap A solid 18k yellow gold

A solid 18k yellow gold Oyster case

and shielded the sensitive movements from the dusty conditions of the battlefield

with the Speedy—but Heuer's obsession with legibility cleaned up the dial in a way that hadn't quite been achieved before

the presence of a Valjoux 72 within a watch’s case is a tremendous selling point

Patek Philippe Tonneau Perpetual Calendar Strap A solid 18k yellow goldA 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, 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? Patek