1961 Fender Jazzmaster. Slab Board Neck. Original electronics and components. Original case. Rarer green guard. The neck has some normal finish wear from regular playing. The headstock has some areas where the finish reacted to particles from the case by the tuners. I’ve seen this happen before on Jazzmasters from this year. Something in the lining. I have no idea what caused the weird war on the back or what exactly is going on. See Black light photos for details.