ruster armchair by yngve ekstr? I have a vintage Dux chair by Folke Olssen that has that exact, loose headrest design. The pigtails on the back seem to be counter-weighted with sand, or somethingorother. File for ref.
Can't imagine how I missed this 1951 Australian entry into the mid century modern lexicon. Grant Featherston lounge chair reproduced by NJ Modern for just 699 bucks! So much style for barely more than IKEA.