Ah, the perpetual calendar—it's a marvel of mechanical memory, programmed to account for leap years in its intricate wheel train. But it's just a machine following a 400-year cycle; it assumes every fourth century year is a leap year. It will fail in 2100 because that year is *not* a leap year, and the watch can't adjust for that Gregorian exception. I know this because my own Patek 3940, bought after my first major shipping deal, will need a trip to Geneva for correction—a reminder that even the finest engineering has its limits against the rules of time.
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