Thanks all, so far very helpful. I would say it's a 1991 as well, most posts on the German forum are pointing in that direction. I would also think this model was sold only in Europe or maybe only imported for Germany, but even in Germany I find only a handful of builds. Blizz, it would be great to learn if the same frame was used by your Canadian guy.
In an old German thread someone mentions that the Summit Max was positioned just as the Summit RL with the same components, same frame with Tange Prestige Concept tubing and both with Ritchey components. the RL had slightly lighter components. Also mentioned is that the frame was build in Japan in the same factory as where Ritcheys were build.
What makes it difficult now is that someone offered me a complete Summit RL in the same size...