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https://sha.org/bottle/dating.htmThe concept is that the higher the side mold seam on the bottle the later it was made - at least in the era from the early to mid 19th century until the first few decades of the 20th century. This dating tool was apparently devised by Grace Kendrick in her 1963 book "The Antique Bottle Collector."
https://sha.org/bottle/examples.htmThe example bottles are tracked though the Bottle Dating page questions in that
..... The Bottle Book (Fike 1987); and Antique Western Bitters Bottles (Wichmann ...
www.bottlebooks.com/dating%20old%20bottles/determining_the_age_of_ old_bottl.htm2004 DIGGER ODELL PUBLICATIONS. DATING YOUR OLD BOTTLES. One of
the most frequently asked questions about old bottles is, 'How old is this bottle?'
www.antiquemedicines.com/bottletypes/bottletypes.htmOLD BOTTLE IDENTIFICATION AND DATING GUIDE ... relative placement in
bottle making history. ... common to snuff bottles and food bottles, 1800s -1850s.
www.antiquebottles.com/dating.htmlDating Antique Bottles. Many people are intrigued to know how old their bottle is.
There are three keys to help with dating most bottles: Side seams: None: bottle ...
www.fire.ca.gov/resource_mgt/archaeology/downloads/Bottles.pdfBottles. There are four important characteristics for dating bottles: ... Before the
modern bottle-making machine, bottles were blown – first free-blown, and then.
antiquecannabisbook.com/chap4/Mold_A.htmTHE SEAM METHOD - OF DATING OF GLASS BOTTLES. Bottle 1840 - 1860*
Seam verily goes over the shoulder, Bottle 1860 - 1880. Seam rises onto the
www.gobourbon.com/dating-old-whiskey-bottles-from-the-19th-century/The first clue for dating these bottles is bottle itself. Hand blown bottles will have be less uniform than machine blown bottles, unless they were blown into a mold. The mold seams are clues as to when machine mold bottles were made. The bottle itself will tend to have air bubbles in the glass.
ourpastimes.com/date-antique-glass-bottles-5760378.htmlDating antique bottles requires knowledge of the evolution of bottle technology
and the ability to research manufacturers and bottling companies. Although glass