Help Identifying Toy - Star Wars Rocket Launcher?

[magg121]

Hi - my son is selling his toy collection and we have bits that we have no idea what or where they are from. Any help appreciated. Believe this to be either a Star Wars Back Pack or a Star Wars Rocket Launcher from a ship. It is 2 inches tall, has the  Empire Symbol on it and a snake type logo on side of rocket. No idea what toy it came off so any help appreciated.