Marked AI 8 391 is the alcohol fuelled version of 991, and this particular specimen still had the alcohol jet, but for some reason it had the thinner paraffin cleaning needle. The air restrictor was also removed- or lost- so I borrowed the mixing tube from this one so I could test it. I will turn a new restriction later on and press into the air tube. It's a worn and battered lantern, but as usual with these Primus models (the 991/1020 burners), you can't fail. Simpler and easier lanterns to get working is hard to find. The third image with the lifted mixing tube is to show the air restrictor at the bottom of the air tube. Here's a shot with it lit. It is as it is this time of the year with the bright nights, even if it's quickly getting darker and darker by the day now! And here's a picture to show the difference between the jet of a normal paraffin one and the alcohol version. The left is a regular No.6348 for paraffin, and the right is the much larger holed one for alcohol. It is unmarked, except for the word "Primus", but sometimes that also is the case with the regular paraffin jets.