I'm not sure where to post this, but have any of you folks seen on of these? There used to be a pic on the Forum with one attached to the radiator of a nice !940s' vehicle, but I can't find it. It is about 3 1/2 inch diameter, and nicely vaulted. Enamel over steel, with no mm on reverse. No idea what the blue glass on back, either. White specks on swaz are dust, dark speck near arm is in the enamel. Thanks for looking.
