Some cars leave a paper trail; the Incomplete left a name and a place in Buick's list. What follows is what can be said with a source behind it.
Its place in the line
Nearby in the Buick catalogue sit the Buick First Call and the Buick Funeral Car.
The record
The open record for the Incomplete carries no verified engine, output, weight or price yet. MotorJury does not fill gaps with guesses; this entry gives the model a home in the catalogue and grows as sourced specifications and photographs arrive. Corrections: corrections@motorjury.com.