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Reverse of photo has written: “Prof Zhan / Mr Atkinson”. Mr J Atkinson was SDC President twice – firstly in 1977 and then in 1984.
Prof. Helmut Zahn was first director of the German Wool Research Institute founded in 1952. He was awarded Honorary Fellowship of SDC in 1969
John – many thanks for your comment. He was indeed awarded Honorary Fellowship in 1969 and the citation is in the SDC Digital Archive. I assume from that this is more likely to be closer to 1977 than to 1984?