Up for sale is a Fender American Classic 50s Precision bass neck. The neck is a factory blem with USED stamped on the headstock and part of the serial number removed. This indicates a defect of some kind. Functionally, the truss rod turns and when loosened, the neck is straight. When tightened, the neck has a moderate back bow. I have not strung it up so it may have fine tuning issues.