Here are some pictures of my Optimus no.11 Everything is different from the 111. The wire bows for kettle support are thicker and lower then the 111, the box is completely different, it's made of heavier gauge sheet metal plate and there are no curled up edges around the top or bottom half of the box. The hinges are different, the handle, the catch... the tank has the pump situated 90deg. to the tank the same way as the lid. The tank and the heat shield are not screwed onto the bracket on the small folding front piece but the two are snapped into place like on a Fuhrmeister. The regulating wheel is not like any 111 wheel I have ever seen and the shaft is shorter. I have no idea how old this stove is and would be grateful for any information.