Solar powered watches are a dime a dozen, but most are just electronic watches with a solar panel to boost the battery. Not this steampunk inspired pocket watch: it uses the sun to spin a mechanical turbine that provides the power.
The Ezekiel Empire Rosenstein Patent Solar Powered Turbine Steampunk Fob Watch (phew!) has a brass turbine that reacts to the sun's light to spin and generate power, presumably somewhat like a Crookes radiometer. If you happen to live in a cave or up near the arctic circle in winter, it can also be hand cranked.
Best of all, is that the watch is available for a pretty reasonable sounding $149.
Hmm, too bad Christmas is almost a year away.