The strange case of John Lennon's missing wristwatch

Yoko Ono gave John Lennon a Patek Philippe 2499 wristwatch for his fortieth birthday on October 9, 1980, two months before he was murdered. This perpetual-calendar chronograph is a horological marvel. As Jay Fielden describes it in his story for The New Yorker:

The watch, which Ono bought at Tiffany on Fifth Avenue, records time in eight different ways; the dial houses three apertures (day, month, moon phase) and three subdials (seconds, elapsed minutes, date).

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