It loks like a 111, I do not belive any other has made exact the same box.
Both the burner and the brass tank use to have OPTIMUS mark or letters. The knob shown has been made in black and red hard plastic. The heat shield has been made in crome ore galvanized steel, and a magnet shold be abel to set on it.
The green color indicates used in some force. Swedish forces had some black text-signes popped on. Norwegian army usually used sivilian models, and may have painted over the sivilian color.
Parts coud be looked up at section of exploded weives.
Note; Pump have been made both in O-ring and leather versions. All roarer burner-versins has orginally leater-cup in pump.
DSK