This is a cutaway display model of Optimus No. 7 with burner 207 from the 1930's. The number on the tank is in the cut-out section, but I am assuming it's the same as the No. 7 presented in this catalogue: https://classiccampstoves.com/threads/1934-catalogue-no-1260.31160/ These cutaway displays are excellent for showing the design and function of stoves. This one has an early generation 207 burner where the cleaning needle is in the upper position when the burner valve is closed. Other time markers include: tank bottom and side embossing indicate "Stockholm" instead of "Upplands Väsby", air screw is marked Stockholm, dimpled spirit cup and old style cookie cutter with tactile lettering.
just corious, it seems to me that the jet cleaning needle rise up whem the spindle is turned clockvise, to shut off the flow. Am I wrong?
Hi @orsoorso - You are correct. This is how the first generation of regulating burner 207 was designed. I don't know exactly when, but fairly soon the design was changed to clear the jet when the valve is fully open instead of closed.
And I also have a cutaway sample of a 207 burner of the later design where cleaning needle is retracted when burner valve is closed:
Thanks. I have an early burner with the needle up when in the closed position. It is on a 1S with the lion paw feet. Beautiful stove! Brad
Hi Ben, Yes - the red insides are quite intriguing. Maybe you could help us find out if this was the case also on other models from around the same era? What about cutting the tank and burner open of this one French Optimus 9 (not Halmia) and post photos for all of us to see here?
