The presence of SunTour Cyclone 7000 would limit this to 1987 or 1988 but the paint job is not from that era. Either the components aren't OEM or it's a repaint. I certainly wouldn't rule out the latter, given the ready availability of Miele decals. It would also explain the lack of a tubing decal. I don't know if it's the camera angle or not, but the pics makes it look like the forks have been pulled back out from a crash, as they appear to have been pulled too far, with the blades having a shallower angle than the head tube.

Miele had a Cyclone 7000 equipped model called the Delta in 1987. There was no Cyclone 7000 spec'd model in 1988. The frame was Tange #2, which typically uses a 26.8mm post, possibly larger if the shop personnel were heavy handed during the honing/reaming operation.