Dettweiler

I just had a cheap, Chinese generic battery pack blow itself up the other day. Managed to move it outside before it caught fire.

It’s very situational. Cracks and dings? No good. Natural checkering from age on an old acoustic? Higher value.

A worn appearance is often desired on old guitars. In some cases, it can even increase its value.

That, and the OP probably did what would be considered finishing someone’s puzzle for them.