Beautiful Seth Thomas Brass Electro Magnetic 792 Acquisition Clock - Working SEE VIDEO. Would look great on your mantle or desk. Made in Germany with an Electro Magnetic movement by Kieninger & Obergfeil. Speed is adjusted by rotating the pendulum. 
Powered by one "C" size battery. Pendulum is held in place with a screw on the back of the movement. Clamps on both sides hold the glass case in place.