This is a really nice item. It is an Optimus 48 Swedish Camp Stove. This little stove was manufactured in the late 1950’s or early 1960’s, in Sweden, according to what I could find on the internet. They seem to be pretty rare. I found people talking about them on line, but could only find one for sale. The one that I found was selling for $150.00. This one also comes with its original tin container.
I believe that it is missing the burner shelf. I am not sure of the right term. Your pan would be set on this. It would be connected to the three rods extending up vertically from the stove.
This item has not been tested. I do not know if it works. If you have questions, please e-mail.