Well, that's fascinating. [MENTION=93662]Charles Wahl[/MENTION];, did you notice that mine is also from Michael's Cyclery? The final picture in post #2 of this thread shows the store sticker. Yes, I'd be quite interested in seeing those docs - thanks!

Here's a point of curiosity for anyone: I measure the chain stays on mine at ~42.25 cm with the hub all the way back in the drop outs. I read an article about chain stay lengths of different classes of bikes and they listed:

Road Racer: approx 41.5 cm or less (down to 390 on time trial bikes)
Audax/Event: between 42 cm and 42.5 cm
Sport Touring: between 43 cm and 44.5 cm

So it seems to me that the Gran Course is a good candidate for possible Audax/Rando use if the hub is set that way. And despite the fact that the 1984 tech specs say "no clearance" for mudguards, it looks to me like I could certainly get larger tires, 28 or 32 even, in there. And possibly mudguards/fenders (depending on your side of the ocean) if I stuck with 28s.

Any thoughts?

Thanks to everyone who's shared their ideas!