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However, there are definitive trends in shapes that mark a bottle as very likely to have been used primarily or originally as a container for high alcohol spirits intended for internal consumption, "medicinal" or otherwise.
Alcohol was of course an important ingredient in many other products also, ranging from wine, champagne, beer, and porter to most patent and proprietary medicines, bitters, and tonics to even preserved fruits.
Additional information and estimates are based on the empirical observations of the author over 50 years of experience; this is often but not always noted.
Various terminology is used in the descriptions that may be unfamiliar if you have not studied other pages on this site.
(It should be noted that implementation of this requirement began in late 1934, so some bottles made that year will have the noted embossing.) This regulation was repealed in 1964 giving an effective dating tool of 1935 to the mid 1960s for this diagnostic feature (Munsey 1970).
Be aware however that for some years after 1964 liquor could still be found in bottles with this embossing since not all liquor producers switched immediately to new bottles due to the expense of new molds or to deplete an existing supply of bottles (Ferraro 1966).
For example, even though Hostetter's Stomach Bitters contained as much as 43% alcohol (86 proof!
As with virtually all of the bottle type categories to follow, liquor bottle diversity is staggeringly complex in depth and variety.
The pictures on this page show just a small bit of this variety.
Prohibition makes a very convenient dating transition point for liquor bottles which is not available for other types of bottles.
However, there were some machine-made liquor bottles and flasks that most definitely pre-date Prohibition.