Buying a guitar from reverb and on the back of the headstock it has what looks like a repair mark from where the neck might have broken off. It doesn't say anything
Repair of a broken off Yamaha acoustic headstock... - Acoustic Guitars - Harmony Central
Repairing a broken headstock with an overlay - Strange Guitarworks
Refinish, Restoration & Repair - EN
Repairing a broken classical headstock - Strange Guitarworks
Is it true that a properly repaired guitar headstock will be less likely to break than one that has never been broken? - Quora