It's a Cannondale Rigid mountainbike from the early 90's, likely and it's worth whatever you can get out of it.
. “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche
"We can judge the heart of a man by his treatment of animals." - Immanuel Kant