I get that English isn't everyone's first language but....Never have seen a headstock repair like this before.
Gibson Thunderbird Vintage Sunburst | Bass Shop Geek IN Box
"Thick front pickup of mellow sound, Toreburi a rear pickup in tight, can be high sound make degree of freedom in a combination of them equipped with a two humbucking pickup freely. Since the humbucking pickup front, there is no noise may become visible even by shaking the balance to the rear."
Not positive, but from the look of the neck repair, I think he shook it too hard to the rear.

Gotta admit, it's the first time I've ever seen a neck brace on a bass. First position could get a bit dicey with this one.