An early Optimus 1300, still with just ”Optimus 300” engraved on the tank. Stefan Apparently Optimus had already intended to use the designation “1300” to this “300” with preheater. Oddly enough the tank is only engraved “300” and not “1300”, but the original box and the spares kit that goes with this lantern are both stamped “1300”. Therefore I think it’s fair to assume that the 1300 designation was intended all along, but for some reason it was not actually engraved on the lanterns on the early production runs. The same phenomena can also be observed on early 200/1200 lanterns. (It’s not unknown for Optimus to only have the full designation on the cardboard box.) On the tank you can see the early “angular” lettering “Optimus” (the same as on Optimus 00 Patent stoves) and the likewise early oval Optimus globe. The top is black enamel fastened with two screws. Among the spares, notice the thin cleaning needle that I think is for the pre heater. The spare jet is marked “300” in an oval, but “Optimus” in not stamped on it.