It seems that both the nut and the fret had been worn, they have been replaced with new ones. The guitar has been heavily used, but it has been taken care very carefully. It is a very beautiful guitar for its age.
There seems to have been exhaustion on both nut and fret, and they were exchanged into new ones. As for the body played a lot, it has been treated with great care, and is a very beautiful guitar for its age.