All, I've edited my first post to include a link to the pdf of the catalog. It's about 4MB and is a little slow to load.
[Edit... The link doesn't work... I'll put it elsewhere.]
[Edit #2: The link should work okay now. Sorry about that.]

Exit.: I e-mailed you the catalog before I figured out where I could put it on line.

T-Mar: Thanks for the input (as always!). Yes, to my knowledge it's the original generation Cyclone derailleur (definitely not MkII). It looks like six speed was just making an appearance, too: only two bikes (super LeMans and LeMans) had six speed freewheels if I'm interpreting things correctly. Also, the Sport DLX has a "freehub"... did Shimano use a freehub that early? (Sheesh... and I thought I knew something about bikes...)