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Owens machine formed suction scars are sometimes mistaken for a pontil mark by the uninitiated; especially the rougher ones like pictured above.

The following excerpt from Trowbridge 1870 makes mention of a "snap-dragon" tool as well as some other bottle production processes and steps: The blower gathered the melted glass, rolled it on a marver, blew into it slightly, then dropped it, in a long, purse-shaped, glowing lump, into the open mould.

The pictured bottle is what is known as an "umbrella ink" and was a very common style from the 1830s up until the late 19th century, though most commonly used between about 1850 and the 1880s.

As commonly used in the and industry, the term refers to the mark impressed on a blown glass item over this scar, since many notable glassblowers have impressed or engraved makers marks in the punt scars of their work.

This is where experience is irreplaceable, and you can only learn so much of it from quickly reading up on the subject.

Wilson for a "Clamp for Holding Bottles" is available by clicking which illustrates one version of an adjustable snap-case tool and a description of how it worked U.

This line indicates the interface between the lower edges of the side mold pieces and the upper edge of the cup-bottom molds base plate.

It often leaves an irregular or ring-shaped scar on the base when removed called the "pontil mark".

1865-1875 patent medicine bottle with a more subtle rounded key mold base without a base center depression.