Ok, so I definitely have a 1986 Bianchi Limited... which looks JUST like the ebay bike, the decals are the same, columbus tubing, I have full Shimano 600... and the headset on the ebay bike looks to be 600.

As for the catalog... from what I've read... Shimano Ultegra didn't come in until early 90's? so I would guess it is mislabeled.