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it features an untouched silver sunburst "sigma" dial with white gold hour markers and intact Tritium luminescent indices and hands
Since the 1940s
Alvin was used to locate a hydrogen bomb lost during the collision of a B-52G bomber and a KC-135 tanker during mid-air refueling
or provided the collector community with proper reference material
Patek Philippe Retrograde Perpetual Calendar diamonds it features an untouched silverA 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?
