*I think it is a replica?* Omega Deville Coaxial Escapement wristwatch in new condition. Buying an Omega Coaxial-anything watch from a dealer is about $3000 or more.
Doesn't use a battery, you can either wind it up with the sideknob or the natural motion of the arm swings the inner pendulum and makes the clock go. I'm 90% sure this is an imitation but I must say the inner mechanics impress me. Works great.
New, found it in a storage that I bought in an auction wrapped in cloth.
4. Price: $135 or trades. Shoot me an offer.