Marvin Malton Bathyscaphe

The classic diver watch is a tool-based timepiece built to be durable. Marvin's Bathyscaphe has a mechanism to measure how long you've been underwater for any given depth and comes in three colors: yellow, green, or blue. "With a rubber strap, you can use this watch for diving," says Cécile Maye, Marvin's CEO, "and then switch to a fabric strap to wear in the city." [$1,680; marvinwatches.com]