These wings were authorized on Jan 25, 1919 for four different functions as follows: Airplane Observer, Balloon Observer, Aerial Bomber and Aerial Gunner. This wings was hated and lasted only until 14 Oct 1921. This is a very well made museum quality reproduction in Sterling Silver of the very rare Blackinton version. Most reproductions of this wing are of the Meyer design, it is very rare to never see a Blackinton. You almost never see a real wing or even a restrike. This has a center clasp pin back.