Primus 521 or Primus 523 ? Nice stove ,Richard.. if it's yours & you wish to pass it on ... shout Internal Link catalogue page 17 . I'd say 523 (silent twin) Nick
Its not mine yet although a trade may happen; there are no marking on the setup though Not many stoves grab me these days but this one may well be calling me.
HI, Brother Richard, I say, "GO FOR IT, MATE"!! It's too nice to let slip away, and to quote Master Pugh, and a few others of our CCS Mates, "You know it makes sense"!! 8) I love the look of this one, Richard, and think you would very much enjoy owning and using something as interesting as this one. Good luck, and please let us know how it all turns out. I'll keep my fingers crossed for you! Take care, and God Bless! Every Good Wish, Doc
From the top it looks like my primus 523 except that the filler is in a different place and the shafts to the controls are different. Mine looked worse that when I got it but a good clean and coat of aluminium coloured engine enamel and although not authentic looks as good as new
Found some info here: App ½ way down the side http://terrence.marsh.faculty.noctrl.edu/lantern/stoveeo.htm