These days all the hype in the watch world is about gadgets that track your steps, monitor your sleep, and even make calls through your phone. But when making an investment in a serious timepiece, you don't want something that requires the latest software update. You want a device that you can pass down to your kids. "Smart watches are very of-the-moment," says Kilian Muller, Tag Heuer's North American president, "but mechanical watches are timeless." The technology in all these models, a series of gears and wheels that rotate the hands, is hundreds of years old, meaning they will work just as well — and look just as good — when the latest e-watch seems as cutting-edge as your old BlackBerry.