It's a Cannondale "Sub One"; has an aluminium steerer (7 1/8" long, race
dia. 1.30, threaded portion dia. 1 1/4"😉; no lawyer lips, no bosses or
eyelets, recessed brake mounting, dark purple colour.
Forks have clamp marks on the dropouts - but it appears as though they
were removed after assembly and have not been used - no chips, scratches, or
other marks other than from sitting in a box in the basement.
$25 plus postage, or trade for something interesting from the pre-click
era (nothing east of the former Iron Curtain, please), or a working 10gig or
so 9mm laptop drive.