Hi all, Here is a 100 CP alcohol gravity donut Mundus II lamp. Unknown maker, but probably the Czechoslovakian "Elektra" company, (Antonin Fridrich "FRIDRICH & PIŠVEJC"). It uses the same burner design as several other Elektra gravity lamps and also my O. Karlin stand lamp. I can't find any patent for this type of burner, but I believe there is one original patent as the source of all these lamps. From papers of a Czech stove site, I found catalogue images (very low resolution, I'm sorry) of this Mundus II lamp, and also of the smaller Piccolo I and II donut lamps in the same style. In one catalogue, dated May 1939, there are also several Wiktorin lamps displayed, so my guess is mid 1920,s into the 30,s ( Elektra patent for a height adjustable fuel tank, working as an on/off fuel device, comes 1920). Although much simpler built quality overall and in burner design, this lamp match the Hugo Schneider Lipsia lamp, both as a user and in performance. /Conny ….before…. catalogue images of the Mundus II (sorry for low resolution) …. ….side by side the HS Lipsia lamp….