Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums General Petroliana Discussion Mobil,Humble and Flying A Signs

Can anyone help from this picture tell if they are real? I generally know that the 12 inch rounds are reproductions but the Mobil ones are not round. Is there a size across the flat part on the Mobil that I should know about. Also, is the large flying A real? Lots to learn.