I have a 75th anniversary 660 Rickenbacker guitar. Dark Cherry Metallic. The finish on the back of the neck seems to have wore off the outer level. The DCM finish is still there but appears that the top layer of finish has worn off. I did have it hanging on the wall for a short period of time but has spent most of its time in its case. Just wondering if anyone else has had a similar problem and if it is fixable. I still love the guitar and it is a joy to play. Thanks, Peter