The earliest bottles were made by a glassblower using a blowpipe, and free-blown bottles will lack seams. Check for a pontil mark. A free-blown bottle will often exhibit a scar on its base from when the bottle was detached from the blowpipe pontil.
Check Dating pontil marks bottle symmetry.
If the bottle lacks mold seams but exhibits a high degree of symmetry, it may be dip- or turn-molded and probably dates before Check to see if seams go all the way from the base to the lip. Note if bottle has seams that extend all the way to the lip.
Dating pontil marks These are machine made and date from the early 20th century and later. Bottles with mold seams and suction scars are made in an Owens Automatic Bottle Machine and date after The Owens machine revolutionized the bottle industry, and made bottles very common objects. Check for embossed lettering.
Embossed lettering can date prior tobut most date to the late 19th century and later. Embossed lettering Dating pontil marks especially common on patent medicine bottles that date from the midth century through the early 20th century. Check for embossed lettering on the base.
This often indicates the bottle manufacturer and will help date the bottle.
Check for the following lettering: These are liquor bottles that date from s. Mold seam extends from just below finish, down the neck and side, across the bottom, and up the other Dating pontil marks. No mold seams on body; horizontal seam around circumference where body joins shoulder, and vertical seam Dating pontil marks up each shoulder.
No embossed lettering; glass highly polished from turning in mold Ca. Made in large numbers beginning after World War I though the first machine was invented in the s Sheared lip. Striations around circumference of neck from lipping tool; mold seam stops at neck obliterated by lipping tool. It is located in a small community garage just off Rt. NBM's annual membership meeting for is scheduled for 1: All members are invited. If you're not sure if you are on the mailing list, contact the museum at or nbm nycap.
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Leave your comment Your Name: A Unique Form of Art. Check for a pontil mark. This often indicates the bottle manufacturer and will help date the bottle.