Champion Spark Plug sign/clock

Champion Spark Plug advertising sign/clock. Yes, still lights and the clock still lets you know you are late! Missing the center piece (assume it was glass!?!). Manufacturer was Oadco in Cincinnati, Ohio. I am aware that Hanover later became affiliated with Oadco, but unsure of any other information.

If anyone has seen this before, perhaps you can assist in letting me know the vintage (assuming 1950's). Or, if you are familiar with Oadco or Hanover, please let me know.

Be well,

Rodger

RPela@aol.com