Like dive watches from the 1960s, this 42mm timepiece features a narrow rotating bezel, clean case lines, and chunky push pieces. A 340-part, hand-assembled movement keeps things going; an innovative dial indicator displays when the chronograph is running, stopped, or ready to be reset. Rated to 328 feet, it's proof that haute horology can go deep. [$10,800; jaeger-lecoultre.com]