One major variety is the 1888-O Morgan Silver Dollar featuring a Doubled Die Obverse (DDO) error. This variety is sometimes known as the "Hot Lips" Morgan Dollar or VAM-4 variety. The doubled die error features a doubling of the Lady Liberty portrait - particularly the lips/nose/chin area. The lips are very clearly doubled (hence the Hot Lips name) and part of the nose and chin are doubled. At the back of the liberty crown - there are a few leaves and features doubled as well.