Internet said Waltham made it. The only words found on it are above the 6; Says "New Haven" & "8 days" The roundish not flat wind up mechanism is w the bottom of device. (Below 6) Under the 12 it has a circular area with a dial in the middle which goes from 10 to 60 Possibly bronze.
A little over 2 inches side to side and top to bottom is my best guess.