Hi,
It was produced under licence by the Japanese firm Epoch in 1989. I do happen to have a Playmobil Epoch catalogue (which includes the rare white suitcase with articlenumber 1000) from 1989, but sadly the rollercoaster is not in there, so that probably means that it was released in late 1989). The parts of the rollercoaster were not original Playmobil, but the figures were and it was an officially licenced product exclusively released in Japan. I am the lucky owner of 2 rollercoasters, one 'misb' and one 'mib'.