I have had this well worn old girl kicking around for a couple of years now. The font is well worn, the Radius No 6, is just legible, as is the shooting star logo, as is Made in Sweden. Dont know whether the burner cap is original. It has the number 5 on the burner nut, and Radius Made in Sweden in the centre of the burner. Now, my question is : Can anybody date it from the font on the filler cap/pressure release valve. It says : A.BOL.RADIUS. It says Patent just below the A.B.R, and Made in Sweden. The combined filler cap/pressure release valve is different to the one Kerophile and I already have, as in the SRG. Dont know about Dr Peter Watchorn, there is insufficient details on his, to make any judgement.