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For a discussion of ground lip or finish click Bottle Finishes & Closures and/or Ground Finish to view portions of other pages within this website that cover this subject.

Their quantities would be very small in any post-1920 archeological assemblage." The following link is to an amazing early 20th century film clip of a mouth-blown "shop" blowing bottles.

It shows two gaffers and one mold boy in smooth and efficient action.

Film clip is compliments of the Owens-Illinois Glass Company.

(Many thanks to Phil Perry, engineer with that company.) Mouth-blown utilitarian bottles have several important diagnostic characteristics which can be helpful for dating.

The primary features common to most mouth-blown bottles are addressed by Questions #4 through #7 which are listed below.

Click the question link to jump directly to that question Other datable diagnostic features and bottle type specific date ranges for the listed diagnostic features are discussed in more depth within other portions of this website.

Probably at least 95% of pontil scarred utilitarian bottles date to or before the Civil War era (1860-1865).

A pontil scar or mark is a very useful mid-19th century diagnostic dating characteristic.

Those “Best by,” “Use by” and “Sell before” dates stamped on the food we buy can be a source of continued confusion for consumers.

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