New Beauclaire finds from 1950:
Mr A. R. Penfold, an industrial engineer, was the curator of the Sydney Technological Museum from 1927 til 1955. In 1934 the museum held Australia’s first plastics exhibition. It became the basis for the collection now in the Museum of Applied Arts & Sciences. In 1950 General Plastics Ltd. donated display boards to the collection, ( See https://collection.maas.museum/object/241720).
I have now found some examples that match those sample boards: