Leather with a vintage effect is leather that looks like old/used leather. This so-called "used look" is intentional and is what makes vintage leather so specific.
Different types of leather can be "trimmed" to look old, so the definition is not always entirely clear. Semi-nubuck leathers, for example, are typical vintage leathers because they change quickly with use and look "old".
Superficial scratches or colour differences on the leather surface cannot be avoided over time and are not a defect.