I believe this sign is very rare because I have never seen another. I have had it for about 25 years and it was in an attic for at least 25 years prior to that. The picture of the stamps are on the back of the sign. The Railway Express Agency has not existed for a long time.I do not know what the sign is made of, but have been told that it's probably masonite. I do not think that it's tin, but rather some kind of plastic. Also, the sign is enclosed in a wood frame. The size is 45 1/4" x 45 1/4".
The item "Large Antique Vintage Collectible Cola Display Sign. Very Rare Advertisement" is in sale since Tuesday, April 24, 2018. This item is in the category "Collectibles\Advertising\Soda\Coca-Cola\Signs". The seller is "amchoul" and is located in North Attleboro, Massachusetts. This item can be shipped to United States.