A brown glass bottle that looks vintage or antique from afar may not be as old as you think. Bottles designed for decorative purposes, or as special reissue editions from various liquid product companies, look much like bottle designs that are much older. With each chart the reader will find accompanying pictures to further aid in bottle identification and age. Chart 1 The Basics of Dating Bottles Readers first need to develop the vocabulary necessary to distinguish early and late forms of bottles. The Internet is a great source of information when identifying markings on antique bottles. Find a credible website to help determine the age and manufacturer based on the markings on the bottle. Find out how markings influence value. The markings on the bottle can have a direct effect on its value.