This is very unfortunately not my stove. However, I was tasked with it's operational restoration and thought to take some photos before it is returned to it's owner. (sigh) Also, I am unable to date this stove from the tank stamping. While there is the familiar circle stamped on the end of the tank, there is no letter(s), only the numeral 5 toward the bottom of the inside of the circle. Puzzling. Based on my following thoughts concerning the fitted burner (if original), I'd guess 1947-1955 as a possible birthdate. Opinions welcome! This particular 41 is fitted with what I believe to be Primus' #4155 silent burner. The Primus catalog from 1952 here at CCS says the 41SP was fitted with a #4151 burner and I am not sure what the difference would be. I do know that the #4155 burner had it's spindle on the right hand side of the jet aperture just like the burner on this stove (I own two #4155's). This means that the cleaning needle extends through the jet orifice when the valve is fully closed rather than fully open as with Primus' later #4190 regulated silent burner which appears in the 1955 catalog. I cannot discern the difference between this stove's burner and my pair of #4155's. The spindle knob matches my pair as well. This burner is well used and shows easily visible signs of deterioration around the burner skirt holes. It was fitted with an alcohol jet and needle when I received it, which is the major reason why it was performing poorly. I exchanged those for a new kero jet and cleaning needle after functionally modifying the modern needle to more resemble the #4155 style cleaning needle. All new pips, gaskets spindle packing, etc, brought this old gent up to functional (if not appearance) snuff. Enjoy!