​Dating bottles by design and shape of features, such as neck and bases: 

​​​“The  L. H. Thomas company was founded sometime in the 1860s by Dr. Levi H. Thomas, a homeopathic physician in Waterbury, VT.,  where he began his ink business in a nearby barn.  He moved to Reading, MI. in 1872, then to Chicago, IL. in 1879.”
Bill Lindsey bottle web site – www.sha.org

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​‘This  barrel mustard bottle is a relatively early example embossed horizontally on one side between the two sets of rings with MOUTARDE DIAPHANE / LOUIT FRERES & CO. (Zumwalt 1980).  "Diaphanous" (implying a very fine product) mustard and similar other imported versions were apparently the "Grey Poupon" of the of the mid-19th century.  These bottles were usually made of colorless or aqua glass; very rarely in other colors.   Very similar shaped mustard bottles of French origin with pontil scars were found on the Steamship Bertrand which sank in the Missouri River in April 1865.  These mustard bottles were among the very few bottle types salvaged from that ship that exhibited pontil scars.  The Bertrand mustards were a bit unusual in that they had 4 closely stacked rings instead of three spaced ones, though the rings were in the usual positions above and below the open label area’ (Switzer 1974).
Bill Lindsey bottle web site – www.sha.org

Miscellaneous Glass : Such as Ink, perfumes and other sundry bottles.

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