Don't know about the years these were made, sometime in the 1980's or 90's? It's a nice lantern from an appearance standpoint but runs very, very hot! In fact, I had to replace the mixing tube! It went to bright red and burned out when I wasn't looking! I've had it about 10 years. Same lantern, with a nice shade made of some kind of cloth. I have a nice clear plastic handle around here somewhere but as usual, I can't find the damn thing! Did Optimus make two different c.p. versions of this lantern? I noticed mine is 300 c.p. and some of the other examples are 350 c.p., anyone know the story on this?