I apologize in advance for the lack of information I'm about to provide and the complete vagueness of the following post, but i'd appreciate your help in determining a value for this bike.

Tomorrow I'm going to go take a look at a Masi. The owner doesn't really ride and doesn't know much about what he has, masis, or bikes in general. This is what i've managed to extract from him....

It's an 1982 or 1983 frame, supposedly an italian, not california made masi.
It hasn't been ridden in the last 5 years and is just gathering dust. He's at least the 2nd owner.
it could be a 56cm
apparently it doesn't have the original fork, the replacement may or may not be aluminum.
it is outfitted with 5-speed shimano components (this doesn't make sense to me at all)
The only thing i'm sure of is that it isn't my size, ant that it'll end up being passed along to my sister, or a friend or someone else much much shorter than me.

Given this lack of information anyone want to venture a ballpark guess at what it's worth? I know the lack of an original fork will make the value drop a lot.
thanks!