I have just got hold of this Radius No. 3. As can be seen it is in never used condition. Unfortunately it was without the burner cap. The cleaning needle is still attached to the stove. This model of stove has a special Radius burner with a smaller inner cap and small outer cap. The inner cap has a grooved rim where the inner cap should be placed in. I do not know when this stove was manufactured but it is in the Radius catalogue 30 but not in the catalogue 56. I assume it must have been made between the 30's and 50's. In the last photo I have put on a normal Radius outer cap to make a better appearance. If someone might have a spare outer cap for this stove please contact me.