I found this Dietz Bestov Hand Lamp last weekend. The air tube is interesting on this one. I read that these lanterns(lamps) were only used inside. Does anyone have any more info on these or pics? Some of the original tin finish is still present and there are hints of gold on the cone and elsewhere on this one. Kirkman states there were 5 variations and I suspect this was a later one due to the winglock cone. Hobson states these burned sperm oil (I think not). Anyone have a pic of the hanger that went with these?