Long Beach, California based importer Moreddi brought quite a few of these cigar armed teak lounge chairs into the US West Coast from Denmark (there is also a version with different, more sculptural arms). Possibly owing to some manufacturing details that are similar to chairs produced by Glostrup, this chair is often attributed to Grete Jalk. Moreddi typically stamped the chairs with a heat brand using the Moreddi name.
However, there are a small number of other marked versions of the chair that have a "Made in Denmark - Design John Boné" heat brand, as this one has. Hence, the Grete Jalk attribution does not appear to be correct. John Boné also designed some coffee tables that have the same branded mark, but apart from that little appears to be known about him. While there is a chance Glostrup might have had some involvement with the production, there was never much about the chair that was indicative of Grete Jalk's style, and the same could be said of the John Boné coffee tables. So, I do not think there is any chance that one could try to argue that Grete Jalk was using the John Boné name as a pseudonym, and I believe that this chair design has been conclusively shown to not be by Grete Jalk.