This is a museum quality reproduction of a WWI unofficial Overseas Hat Badge featuring the aviation section of the US Signal Corp. This is an extremely rare item that was hand made for someone in the war. Approximately 1 inch in size. I found this on a uniform of a grouping form a WWI Aviator. The owner loaded it to me to make the reproductions. This is the only one of these I have ever seen. An idea item for any WWI aviation collection as the odds of ever finding a real one is nil.