This refers to a joining of a violin head that is detached & seperate, back to the neck of a violin. The head can either be a 'new head' that was not originally with the instrument or it can be the original head attached to a 'new neck'. Or it can be the original head RE-ATTACHED to the original neck. Therefore a grafted neck/head is not necessarily a sign of either age or quality. If a violin does have a graft, signs of this will appear on the pegbox & neck