This product is a WW1 Royal Horse Artillery 19mm domed button made of brass by Firmin London. The button was issued during the era of 1914-1945, specifically for use in the British Army during World War I. It is a collectable item that holds historical significance as a piece of militaria from the great conflict. This button represents a part of British military history and would be a valuable addition to any collection of World War I memorabilia.