If you are buying a mechanical vintage timepiece, timekeeping will never be the same as modern day watches. I would not sell a watch faulty and gaining or losing unacceptable amounts of time. Perfect Timekeeping is not a fair asking for a vintage watch, also they have unknown service history.
We accept offers so please feel free to make your Best Offer,
Worse I can do is Apologize, kindly just consider that to do
Not devalue the item.:)