Legally, most states have time-based rules for the definition of “historic” or “classic” for purposes such as antique vehicle registration. For example, Maryland defines historic vehicles as 20 calendar years old or older and they “must not have been substantially altered, remodeled or remanufactured from the manufacturers original design” while West Virginia defines motor vehicles manufactured at least 25 years prior to the current year as eligible for “classic” car license plates.