Solar Powered Turbine Fob Watch
The story goes - this is the second and even more technologically advanced timepiece from the indubitable Dr von Rosenstein. Its hinged lid's brass turbine blades (themselves incorporating solar sensors), rotate to generate the transformed power- (the turbo may also be hand-cranked), and conceal the patent Galvanic Scale dial-face. Lid has a magnetic fastening hatch. With back-up-battery-powered quartz movement. A steampunk must have!