Strange, if you look at the '92 brochure the PDM scheme is done with anthracite instead of black like yours, so it isn't a '92 either... And 1990 used the same scheme as '89 AFAIK, which is completely different. Not much later than 1993 they stopped using the PDM scheme altogether as the team was ceased in 1992.

Maybe they used both tubesets for the frame, as they were more or less same quality...