Picked this up at the 2005 Nat in San Jose. It ran fine & kept time to within 15 s / week until this May, when it refused to run more than 1/2 hour. I dissasembled it & found all kinds of junk inside & in the mechanism. After cleaning it works even better than before...no jerking of the second hand anymore, and almost no mechanical noise too. Dial diameter is 12", overall it is about 16" in diameter. Very interesting art-deco era piece.