Warning Do not estimate a bottle's age by its shape. This is done to allow the user to get more information or clarification as they proceed through the key. One unique closure to the late s was a three point screw top. Likewise, the Coke manufacturer also took out patents for some aspects that can help you identify them. It is easy to date Coke bottles that are made by the Root Glass company.
Most free-blown bottle date prior to and can be much older. It is true that the mold seams can be used like a thermometer to determine the approximate age of a bottle. All of the bottle mouths shown below were machine made. The middle picture shows an open pontil on the base of a cylindrical medicine bottle. Check for lack of bubbles and uniform glass thickness.
How to Date Antique Glass Bottles
Dating Bottles by Color Is the bottle machine made and aqua- or light green in color? Slowly the corked top bottle began to disappear in favor of the screw top. Only a relative few geographic areas or areas of collecting interest have received more than cursory historical treatment and the majority of this is due to the efforts of collectors.
Another exception example is that the bottles for expensive, low production liquors e. How to Identify Perfume Bottles. The disk-like mark is sometimes confused with a pontil.
How to Identify Antique Glass Bottles. The shape of Coke bottles is also unique. This was the manner in which the early Owens bottles were blown. This will be shallower, online wider and more perfectly circular than a pontil mark.
Dating bottles by their seams
Is embossed lettering present? The pictures below are from two early machine made medicine bottles. They will also have other machine-made characteristics as described on the Machine-made Bottles page. Keep in mind that older technology often persisted and some bottles date later than you might think.
Other information on this website usually must be reviewed to fine tune the information about a specific bottle. It is just that the bottles should be circulated in the city mentioned. The best the following key can do is get a user to a reliably close dating range estimate.
As Coke is a large manufacturer, it usually produces bottles to circulate in different cities. Before manufacturing Coke bottles, Coca Cola was produced in soda fountains. Do the mold seams disappear in the neck, but the bottle lacks a pontil mark?
The earliest bottles were hand-blown by a glassblower with a blowpipe and lack seams. Bottles Circa to Look for side mold seams. Many identical shapes persisted through time and others were brought back for nostalgia and made common again. Is the lettering applied and in color? Is the base indented with an irregular to round pontil scar?
- In the neck on the right notice how just below the collar the mold seam goes complete around the neck.
- Root bottles carry model numbers.
- In the center of the Owens Ring the Owens mark is shown the diamond.
How to Date Antique Glass Bottles
When a dating sequence dead ends, it will be noted and other website pages suggested and hyperlinked for the user to consult. This entire website is essentially a key to the dating and typing of bottles. By the midth century, embossed lettering and marking on bottle bodies and bases, denoting manufacturers and products, made more precise dating possible. The information on this website will, however, usually produce a reliable manufacturing date range for a majority of American utilitarian bottles manufactured from the early s to the midth century.
These two manufacturing types can be hard to differentiate from each other, though free-blown bottles are almost always round or oval in cross-section and have lines that are not sharp i. Dating antique bottles requires knowledge of the evolution of bottle technology and the ability to research manufacturers and bottling companies. The the lower left corner you can see evidence of the diagonal mold seam which at one time bisected the base. We will also provide you some tips which would help you in this process of differentiation. This is another indication of a machine-made bottle.
The base of the second bottle whose lip was shown above right is displayed here. The earlier green glass ink bottle is also certainly machine-made, most likely on an early semi-automatic, blow-and-blow machine based on its crudeness and lack of a suction scar. The picture to the left shows both of these mold seams click to enlarge. Recycling was very common until the midth century.
Dating Your Old Bottles
- The scar was left when the pontil was detached from the bottle.
- Note the diagonal line which cuts across the base is obliterated by the Owens Ring the large off-center curcular feature.
- This is different than an older hand tooled, hand blown bottle.
- Having stated the above, there are still many diagnostic features or characteristics that provide a high probability of both dating and typing a bottle with some precision.
Dating Antique Bottles
Return to the top of this page. Published works generally cover either a particular city, region, or category of bottles. Now that you have understood that story of glass bottles of Coke has history similar to that of the company, this is small attempt to date Coke bottles. It would be difficult to present everything in detail. No material may be copied for commercial purposes.
This is called a cup bottom seam. For example, glassblowers still make hand-blown bottles today. Using physical, manufacturing related diagnostic features, matchmaking kv most utilitarian bottles can usually only be accurately placed within a date range of years i.
How to Date Coke Bottles 15 Ways to Tell if that Iconic Bottle Has Value
Usually, symbols must be renewed periodically. These bottles will, however, have the vertical side mold seam progressing all the way to the very top of the finish side, just not onto the rim. See the References page for more information.
Also, over the years, there had been differences in branding the bottles. Inside the Owens ring are several numbers. Newman's key made a noble attempt at simplifying bottle dating, but is weakened by the fact that the subject is much too complex to be conducive to such a simple approach by itself.
How to Identify Genuine Antique Decanters. All turn-mold bottles are round in cross section and unless stained, will usually have a polished looking sheen to the glass surface. It is unlikely that this bottle was made during the same era, but instead was reused for a lengthy period or otherwise retained until broken or discarded.
Click canning jar to view the typology page section devoted to that category. Fire Polishing - Occasionally encountered machine-made bottles may have fire polished finish rims - a process which eradicated evidence of the neck-ring mold seam on the rim of the bottle. As above, click on the image to view a larger and much more readable version with the various features pointed out. Is the bottle highly symmetrical, but lacking mold seams?