Got it (well according to 1stdibs, anyway)!
This sling chair was designed by British architect Dominic Michaelis in the 1970s. Known as "The Sail Chair" for obvious reasons, this particular piece retains its original label that identifies the manufacturer as Moveis Corraza in Piracicaba Brazil.
https://www.1stdibs.com/furniture/seating/lounge-chairs/sail-chair-desig...
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