A8542 - 1988 more spring than "late"
...such an early Stuttgart frame is... inexplicable for the time being, and there are more. (I don't rule out the dating of frame 87/88 being "postponed" - I don't have a single undisputed date frame from that period) - I know that the painting pattern appeared before naming the team, but that's all...
F5242 - early 1995... is it definitely not Corsa Extra SLX ? In 1995 all new models had ovalised/oversize tubes, riflings in steerer tube is rather "old" Columbus... the photos will help...