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This works with all countries in North America and will date bottles up to 1920.

In short, there was (and is) nothing to stop a glassmaker from using an obsolete method in the production of a bottle.3.It is unlikely that this bottle was made during the same era, but instead was reused for a lengthy period or otherwise retained until broken or discarded.Pontiled base fragments could also be from later produced "specialty" bottles which are described below.5.Some technological changes were expensive and not adopted by glass makers until it became an "adapt or perish" issue and many glass factories just perished.The shift to the fully automated bottle machine from mouth-blown and some semi-automatic methods in the early 20th century is the classic example (Toulouse 1967, 1969a). The same bottle could have been recycled and reused many times for many years before finally being discarded - entire or broken (Busch 1987).

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