One of the most frequently asked questions about old bottles is, 'How old is this bottle?
' Often beginners have a difficult time distinguishing between old and new bottles especially when is comes to modern reproductions.
The following charts and pictures on the dating bottles pages listed below should help.
The author created this website as a BLM employee and continues to update and enhance the site in retirement as a volunteer.
This website now has a permanent home courtesy of the Society for Historical Archaeology (SHA). This entire website is essentially a "key" - albeit a complex one - to the dating and typing (typology) of historic bottles.
(Specifics on what a pontil looks like or how to tell the age based on the mold seam can be found in Bottle Basics.) While these two characteristics are often a strong clue to age, readers will be further helped by developing an understanding how the various categories of bottles changed over time.
To aid beginning collectors and those interested in bottles I have developed a number of bottle time lines.