The international version of the Duncan Wheel, made in West Germany (so, before 1990!). This hard-to-find version (at least here in the USA), was sold in Great Britain and other European countries. Identical hub cap design to the American version, but with a different model name.
Don Robertson was a European Yo-Yo champion around 1972 who first worked for Lumar (a European yo-yo maker), along with Art Pickles, a very popular yo-yo demonstrator from Britain. He then worked for Duncan Yo-Yo, also as a demonstrator. In 1986, Don Robertson authored the paperback 50 Tricks with a Duncan Yo-yo. See a much older Don Robertson (1990) demonstrating his yo-yo skills in front of a live audience.
