Base does not have a date stamp, just marked Made in Sweden. Burner is like centre one which in "Bryans Introduction to PTC" is believed to be a type made in 1950s. Reading his excellent description I suspect this stove to be somewhere in the 1960s but regretably have no marking to support any dates.
Hi, I agree with your dating estimate. It appears to be a Primus No.100 from the PTC period, but later than the first few years of the company, perhaps post 1964? This model has the reserve cap mounted on the pump knob and seems very similar to examples posted in the Gallery by Matukat: https://classiccampstoves.com/threads/13839 and Ian: https://classiccampstoves.com/threads/20692 Best Regards, Kerophile.
Lovely shot of burning copper salts... 1st time that Classy Classic has burned for a while .It sometimes seems a shame that they soon turn to blue. MMMMMM Discus stove :-) Nick.