Very interesting bike. Can't quite read the decal, but is looks like 14 speed? If so, that would indicate that the 7s Tricolor group is original and would date the bike to 1988 or '89. Not sure when 6400 went 8s, but soon after. The 6300 crank is an oddity. What is 105 in it?

Look for date codes on the equipment and let us know what you find.

Love the decals - very late 80's!