Thanks everyone! Tonight I followed up with the seller of the sign. He told me his family sold the house in the 1970's. Apparently 1965 is when the station closed and became a full time house. It is located in Northern Iowa. Hopefully one day I will have a reason to be in the area. I don't know if showing the current home owner a photo of the property from the 1930's as a gas station would excite them or not, but I will keep you all updated.