By the looks of it, it looks like you have a 1995 Homegrown Frame, built-up by a previous owner. The frame looks to be in amazing shape. My concern would be that you are using too large of a rear tire, it looks like it is pretty close the frame. It is not a Proj. Underground, as there isn’t any transition to the drop-outs Carbon-Titanium, rather it’s a one piece. If all the derals & head-set are clean & good to use, the chain isn’t worn out or the cranks – you got yourself one hell of a steal.