Cartier Limited Edition Roadster XL Watch

"I love timepieces, and this is my favorite," says Bosh of the Roadster, with its conical, speedometer-like glass date window and dashboard-esque walnut burl accents – which recall the details of iconic British drop-tops. "I snap it on when I'm dressing for special occasions." [From $6,950; philippeswatches.com]