I've seen a nice auto watch that is in good nick, but the seller has stated that the power reserve is only for a handful of hours. Is that a warning sign of bigger problems, or a mainspring that needs changing?
Depends if the seller knows what they are taking about.
I bought a "broken" Seiko 5 a few years ago for a couple of quid because they seller said it only works for a few minutes if it's shaken then stops again.
Took a punt and it turned out to be fine, seller didn't understand autos.
I've seen a nice auto watch that is in good nick, but the seller has stated that the power reserve is only for a handful of hours. Is that a warning sign of bigger problems, or a mainspring that needs changing?