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Giving a bottle an arched shape at the bottom means that if it does sag, it can do so without touching the bottom.(British Glass 2004) In conjunction with the finish (lip), the various attributes and features found on the base of a bottle allows for some of the better opportunities for the manufacturing based dating of a bottle.

Mouth-blown bottles - Mouth-blown bottles have a side mold seam which terminates on the neck or within the finish (lip) below the top of the bottle; or less frequently, have no apparent side mold seams.

All mouth-blown bottles have in common the fact that they were blown with the force of a glassblowers lungs, not mechanically by machine.

Currently, the best "one-source" work on the subject of makers marks is Dr.

Julian Toulouse's 1971 book entitled Bottle Makers and Their Marks. (Though long out of print there is a reprint available - click Bottle References for details.) In addition, David Whitten maintains an exceptionally useful website of bottle (and insulator) makers marks at this link:

For additional information, click Dating Page to go to the pertinent section of that describes the differences between these bottles.

Once you have determined which type bottle you have - or if you know already - click on one of the following links to move directly to that section of this page (there are numerous links back to this index scattered throughout the page): A.These are usually some type of embossed letters, symbols, and/or numbers which were molded onto the base of the bottle for a variety of glassmaker determined reasons.Click Owens-Illinois bottle base to view a picture of the relatively elaborate bottle base mold markings used by the Owens-Illinois Glass Company during the mid-20th century.Some markings indicate the glassmaker or manufacturer which produced the bottle; other markings were mold identification numbers or of unknown glass maker utility.For example, the particular style of "star" on the base of the liquor bottle pictured to the left is widely acknowledged (in the collector world) to be a decorative marking of the San Francisco & Pacific Glass Works (SF&PGW - 1876-1902) since most of the bottles with this marking are either found in the West or are otherwise embossed with Western company and/or product names (Toulouse 1971; Zumwalt 1980).When referring to "markings" or "features" on the base of a bottle on this website, we are referring to embossing, mold lines, attached glass and/or mineral deposits which are confined within or around the edge of the bottle base.

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