This is a Royal Copenhagen 2010 miniature collectible plate or "plaquette" featuring the Rosenborg Castle in Denmark. 

• Brand: Royal Copenhagen

• Year: 2010

• Subject: Rosenborg Castle, a renaissance castle in Copenhagen

• Material: Faience/porcelain

• Features: It is a small, round plate, typically about 3 inches in diameter, and is pierced for hanging with a string or wire