Vintage Neon Dr Pepper Advertising Clock

I inherited this vintage Dr. Pepper clock, but have no information about it. I've tried to research it, but have been unsuccessful. This is one of Dr. Pepper's large clocks. As you can see the neon light works, but the electric motor for the clock itself does not. Does anyone know where I might find a replacement motor or what type of place I could take it to to repair the motor already in it? Also, any ideas on how much the clock is worth?