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Interesting item, although I'm not exactly sure of the model of Artifort swivel chair here.
According to the seller, this is the F978 chair, designed by Geoffrey Harcourt in 1968 and pictured here. I'm not convinced, but it's definitely of the era and branded Artifort on the rear of the base, so it's certainly a period item of quality.
Not perfect, with some pulled threads and the odd paint chip on the base (see description for close-up shots), but at £300, it's a lot cheaper than picking up a new vintage Artifort chair.