The reason this is noted here is that the concept keeps popping up in the literature of bottle dating and identification ranging from Sellari's books Sellari Unfortunately, the complexities of precisely dating bottles is beyond the scope of any simple key. Another exception example is that the bottles for expensive, low production liquors e. If you know your bottle is machine-made click Machine-Made Bottles to move directly to that page. This exception to the side mold seam "rule" was caused by the specific workings of these machines which masked the upper portion of the side mold seam. As a corollary to 1, consider the following quote: These two manufacturing types can be hard to differentiate from each other, though free-blown bottles are almost always round or oval in cross-section and have lines that are not sharp i. Also linked to the Dating page is a sub-page called Examples of Dating Historic Bottles which tracks a few different bottles through a dating and general information quest to illustrate how the dating process and this website work. For example, the early mineral water bottle pictured here is known to date between based on the information provided by the embossing company name embossed on the pictured side and the glass maker - Union Glass Works - embossed on the reverse and complimentary research done by collectors Markota This website was prepared based primarily on information about bottle manufacturing technologies, processes, and styles specific to the United States. This entire website is essentially a key to the dating and typing of bottles. The ghost seams are caused by the parison mold parts and if visible enough will be "attached" to the vertical seams in the finish.
The dating guidelines found on these Dating Pages and the entire website do not always work well with what the author calls "specialty" bottles click for more information. Produced during the era where all bottles were an relatively rare and cherished commodity to be discarded only when broken i. They will also have other machine-made characteristics as described on the Machine-made Bottles page. 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. The presence of a circular valve mark on the base of a bottle typically a wide mouth bottle or jar is sure evidence of machine-made manufacture by a press-and-blow machine. In another instance, worker opposition was so strong that the machine operations were abandoned! This website is designed to have the informational depth, pictures, and illustrations necessary to solve the problems of the Newman key though his warning still holds though hopefully less so. The ghost seams are caused by the parison mold parts and if visible enough will be "attached" to the vertical seams in the finish. For example, the early mineral water bottle pictured here is known to date between based on the information provided by the embossing company name embossed on the pictured side and the glass maker - Union Glass Works - embossed on the reverse and complimentary research done by collectors Markota No material may be copied for commercial purposes. It does not attempt to address the dating of "specialty" or imported bottles made during that time, though much of the information found on this website is pertinent to these items to varying degrees. This can be due to one or a combination of factors including post-molding hot glass "flow" masking the mold seams, fire polishing of the bottle body, or atypically good mold fitting precision. Turn-mold bottle body showing faint concentric rings. What type of bottle is it? Other diagnostic tools must be used to date these items. 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. This bottle dating "key" is a relatively simple "first cut" on the dating of a bottle. For instance the Carr-Lowery Glass Company Baltimore, MD began automatic bottle making in , but retained some hand-blowing operations until at least when Dr. This website was prepared based primarily on information about bottle manufacturing technologies, processes, and styles specific to the United States. Author reserves the right to update this information as appropriate. Answers to these questions will then direct a user to one of the two additional dating pages which are extensions of this key for the two major classes of bottles - mouth-blown bottles and machine-made bottles. Click on the picture to the left to view an illustration which shows both of these seams or click machine-made finish to view an image which shows well the seam below the finish. If it were that simple much of this website would be unnecessary! Specialty bottles can be, of course, occasionally found on historic sites usually fragments, but occasionally intact but can rarely be used to help date the site because of the diagnostic problems and deposition lag issues noted above. If unsure about what the lip, rim, or finish of a bottle is, check the Bottle Morphology sub-page.
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