This is a brass shoulder title which I believe dates to the early 20th. century due to its design. Most likely a shoulder title from the era of the Great War.
I suspect that this brass title is associated with the Irish Red Cross. This makes it a quite historic piece as the Red Cross in Dublin served throughout the Great War in various caring capacities. The Red Cross also saw active service in Dublin during the 1916 Rising and subsequent War of Independence.
The title is in excellent condition.