How can I tell its worth? Is a pontil mark present along with disappearing side mold seams? One of the most common emails I receive comes with a description of a jar—e. It does not attempt to address the dating of "specialty" or imported bottles made during that time, though much of the information found on this website is pertinent to these items to varying degrees. There are many of them for sale online, and are not hard to find.
Specialty bottles can be, of course, occasionally found on historic sites usually fragments, but occasionally intact but can rarely be used to help date the site because of the diagnostic problems and deposition lag issues noted above.
How to Date Antique Glass Bottles
The Ball logo has remained relatively standard since the first script logo was introduced, but there have been a number of small variations that can be used to date the jar. It also includes "Bottle Dating Worksheets" pages 51 to 55 by Rebecca Allen and this author to assist in the systematic dating of an historic bottle based on the information in that dating key as well as other information on the website. I have a half gallon aqua mason jar with Mason's N Patent Nov 30th on it. This is also when Ball began underlining their logo. Is the bottle highly symmetrical, but lacking mold seams?