Why every man should have a formal dress watch in his collection telegraph.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from telegraph.co.uk Daily Mail and Mail on Sunday newspapers.
Watches and Wonders, a big online watch fair, is happening right now and one of the most interesting new releases comes from Cartier. The brand has just unveiled a new line of Tank Must de Cartier watches and among them is a new solar-powered watch called the Tank Must SolarBeat. It's hard to tell the watch is powered by light.