Dating antique glass bottles How to Date Antique Glass Bottles

Dating antique glass bottles

The concept is that the higher the side mold seam on the bottle the later it was made - at least in the era from the early to mid 19th century until the first few decades of the 20th century. Note the diagonal line which cuts across the base is obliterated by the Owens Ring the large off-center curcular feature.

As the information under this question notes, ACL's in the U. Is embossed lettering present?

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In addition, this site also assists the user with these questions: If it were that simple much of this website would be unnecessary! Chart 1 The Basics of Dating Bottles Readers first need to develop the vocabulary necessary to distinguish early and late forms of bottles. Before jumping into the key, it must again be emphasized that no single key can get a user to an absolutely precise date for any bottle.


The Blasi and Holcombe books in particular have excellent overviews on what is known of the product history and supports the date ranges determined above. Empirical observations indicate that Canadian-made bottles very often followed similar glassmaking technique and process chronologies making much of the information applicable to Canadian made bottles. The opinions expressed are those of the author of this website and not necessarily those of The Society for Historical Archaeology nor the Bureau of Land Management.

This is consistent with the very flattened embossing on this bottle can not be seen in the picture.

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The user is now directed to move to Question 6which deals with diagnostic base features. Close up of iron pontil The user is now directed to move to Question 2 which deals primarily with the side mold seam.

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Bottle "B" differs from "A" in that the side mold seam ends a quarter inch below the lower edge of the finish and there are horizontal, concentric tooling rings around the upper neck and finish "wiping" out the mold seam. The bottle also does not have a ground down surface at the top of the dating antique glass bottles i.

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Published works generally cover either a particular city, region, or category of bottles. Acceptance often occurred over a period of many years or decades in some cases. Start with Question 1 on the Dating page. In the experience of the website author, these machine-made bottles are rarely encountered and likely a dating antique glass bottles of early machine-made wares to s that had less precise mold fitting and resulted in the need for fire polishing to enable proper closure.

The picture to the left shows that the base of this bottle does have the distinctive "Diamond-O-I" marking just under the "7".

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We now have refined the bottle age range a bit more - between about and The picture to the left top shows that bottle "A" has no evidence of any type of pontil scar or mark on the base. Time has taken its toll on records, of course, but much of what happened in the past was simply not documented well or at all as with most endeavors of common people in the past.


Is the bottle highly symmetrical, but lacking mold seams? So the answer to Question 4 is "NO" which indicates that bottle "A" is not likely to date prior to Dip mold bottles usually date prior to but can also be much older back to early 18th century at least. A user need go no further through the Dating page questions to refine the date further. The user is now directed to move to Question 4 for bottle "A" - the first question in the section of the key that deals with the dating of mouth-blown bottles.

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One can find quite a bit of information on my web site and across the Internet about dating bottles based on whether the mold seam goes up and over the lip or if the bottle has a 'pontil' on the base. YES - This bottle was produced in a turn-mold which was also known in the glass industry as a paste-mold.

See the About This Site page for more information about the author and contributors. Newman's key made a noble attempt at simplifying bottle dating, but is weakened by the fact that the subject is much too complex to be conducive to such a simple approach by itself. The disk-like mark is sometimes confused with a pontil. At this point smooth post-bottom mold conformation, tooled finish we now have a probable date range of between the early s and for bottle "B".

Reuse, of course, does not change the manufacturing date of the bottle itself, but care must be exercised when using the known date of one or a few bottles to date other items found from the same context.