Hello from Airmont NY,very interesting site I’ve been saving “stuff” all my life .I’ve had this sign for 40 years and never seen one exactly like it .14 x24 flange.can anyone date it and is it rare?I cleaned with fantastic and that’s all I did to it.should I put liquid gold or something better or leave it be?can’t figure out how to add pictures but will keep trying.dark blue with white lettering polarine/the standard oil/sold here . It’s porcelain.thanks,I’ll add the pictures if can ,working off a iPad.