11 1/2" diameter. It is missing one of the brass accent circles on the face and another is just taped into place. I don't know if it will work once the battery is installed. I don't have a battery that fits. I held an AA against the metal contacts and the clock functions did not move. 

Everything on my hmnpwr site and my sister's 2vegburg site is from our parent's collections. They started collecting in the early 70's, mainly in the San Francisco Bay Area at the flea markets, shows, auctions and estate sales. They also traveled to LA or the east coast to buy and sell. Their interests were mostly early American to midcentury American and Scandinavian ceramics. They also collected tableware, concentrating on California production. We regularly list new pieces that have been stored away for decades.

If for any reason you are not satisfied, just contact me; I accept returns and will pay shipping both ways.