I recently picked up this nice vintage desk chair, with aluminium swivel base.It's old and used, with great patina.I was trying to figure out who was the designer or producer but it the chair has some strange deals. The aluminium sides are common for artifort chairs design by geoffry harcourt, but normally they don't have the extention to the backrest. Something I did see on for example the eames lobby chair. Any ID suggestions? 
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