Another present from my good friend dday in the US to go with my 500, 500a, 502, 520 and 530. The 501 was recalled by Coleman because of the round vaporiser not being able to do its job. It was replaced with the very efficient 502. Although I did get the 501 to light the stove did leak un- vaporised fuel all over the place. Maybe it was just me doing something wrong but as it is for my collection and not to use I don't really care.