OR is an exact reproduction of a period item. Evaluate the work as a whole. Keep in mind that this entry is at Intermediate Level, regardless of the skill of the entrant. Explains original research or experiment. Explains any deviations or variations from period norm.
Most stringed instruments are period in some form.
Authenticity rests with detail and emphasis. Top scores for multiple moving parts, e.g. harpsichord action. Finish and decoration. OR piece isn't logical in context of period.