Sorry it took so long to get back to you been dealing with a family emergency the sign is 17 inches by 13 inches there are no markings on the back except for an old spiderweb nest and a faded made in America sticker
I collect old vintage Coca Cola 7 up soda beer signs like that. If it were a replica it would be stamped on the back and it was made in China Taiwan or New Guinea
Also if it were a replica would most likely be made out of aluminum is a magnet does not stick to it its a Luminum I don't mind it does its steel or 10 which would make it