What's the Ultimate "Go Anywhere, Do Anything' Watch?

We asked a handful of watch pros the same question: If you could wear only one timepiece for the rest of your life, which would it be?

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THE SAME WAY you wouldn't plan a heist without first assembling the right crew, most watch guys would be loath to go through life without a lineup of distinct wristwear for every possible situation: the elegant dress number, the vibrant vacation watch, the rugged adventure piece, the one that's a master of disguise.

And yet, at the same time, there's nothing watch geeks love talking about more than the idea of a GADA watch—as in “go anywhere, do anything”—the daily driver or beater piece that's built for all occasions, able to seamlessly slide from a Champagne-and-caviar soiree to a deep-sea scuba dive. So I asked six serious collectors and dealers to share the watch they'd keep if they could own only one.

ZOE ABELSON, Founder, Graal: PATEK PHILIPPE AQUANAUT 5065A