Holy smokes I need to clean my basement more often! That is a high end bike frame, De Rosa experts can comment on the particular model. The components are Campy Super Record. If you look on the inside of the crank arm there will be a date code, single digit number inside a shape, probably a circle, maybe a triangle or square. I'm going to guess a 5 in a circle which will make the group 1985. More than likely it is original to the bike.

Value depends on on where you're trying to sell it, but people like these bikes a lot and that one looks to be in good shape, $1000-1500 in the US.