You are bidding on a U. S. Army uniform button. I have no idea of era so I will be listing all the uniform buttons under WWII. The back is marked J. Bailey Co., Newark, N. J.. It is 1 and 1/8 inches in diameter. I will be selling hundreds of old military items that came from a local estate. His collection was built over fifty years. I am not an expert. I will try to describe as best I can. Please ask questions and correct me when I am wrong. There are a few items from the civil war, most from WWI or WWII, a few items may date from the Vietnam era. I will try to list 15-20 items per day. It is in very good condition. I combine shipping on multiple purchases.