well, multiple spray painting could mean someone knew they should keep it well painted but not how.....or it could be someone who did not know the beauty of celeste green and prefer spray paint....or it could be a hot bike someone was trying to disguise.
Bikes have a BIN number, like a VIN number on a car. I think it is underneath the bottom bracket on most. Locate that and there are sites that list hot bikes.
I'm converting a Motobecane I found literally on top of a pile of junk by the road to a freewheel. The first thing I did was do a search. My LBS does the bikes for the local bike cops so he used their resources too.
Nothing came up.
We figure someone took it out of the garage where it sat since the '70's to save now on gas, not knowing simple upkeep it quickly had problems, they tossed it out.
They probably did not read this:
http://forums.teamestrogen.com/showthread.php?t=6861
Could be the same for yours.
If the bike fits and you like it, powdercoating is an inexpensive way to repaint. You'll loose any decals but they are gone anyway. If it's Bianchi it's probably steel and water is the enemy of your potential life-time steel frame. So you must keep it protected and that means paint.
With powder coat the bike will be stripped, you see if the painting masks any dings or rust and...you get to pick the color too!