The Owens machine revolutionized the bottle industry. This inscription is only seen on Owens-Illinois Glass Co. Be sure to include a photo. Can you tell me anything about this bottle?

Dating Antique Bottles

This technology lag makes some diagnostic characteristics better than others for dating. Machine-made bottles tend to have few if any bubbles in the glass and the thickness of the glass is usually more uniform throughout the bottle as compared to mouth-blown bottles. Mouth of Bottle Perhaps the most obvious key to age is the mouth of the bottle. In another instance, worker opposition was so strong that the machine operations were abandoned!

Click knurled base to see such as defined by a Owens-Illinois engineer Phil Perry, pers. 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. Mold Seam Most bottles produced in the past years were formed by blowing molten glass into a mold.

The screw top is black with decorative lines etched vertically down the sides at different lengths. How much would this bottle be worth. The the lower left corner you can see evidence of the diagonal mold seam which at one time bisected the base. Also, the format and space constraints of a journal article do not allow for the elaboration and illustrations necessary to make a key function fully Jones b.

Entire classes of bottles break the rule. Plastic caps for screw thread finishes can be an excellent tool for dating. The cork finish versus screw-thread finish can be helpful in dating machine-made bottles but only allows for a moderately accurate dating break which to a large degree is bottle type specific.

Please be aware that in order to gain the maximum information about any particular bottle e. The statement about machine-made bottles may seem contradictory finer but more visually distinct but is a function of the higher machine blowing pressure. Michael Owens is the second person shown picking up and examining a couple beer bottles.

This is the base of the bottle whose lip is shown above left. This will be noted where known. Unlike most screw caps, the three point screw top had three lugs jutting out from the lip which were to engage a metal cap. All of the bottle mouths shown below were machine made. Combined Makers Markings Table - Out of date but useful.

Bottle Dating

Antique bottle dating
  • For a broader discussion of this subject see Lockhart, et al.
  • Return back to this page by closing the Bottle Morphology page.
  • In one glass factory a wall had to be erected between the hand operations and the newly installed machine to prevent sabotage.

How to Identify Antique Glass Bottles. Estimating the age of antique bottles can sometimes be a difficult task even for the experienced collector. Bold and garish colors are also rare in antique bottles, so beware of bright reds, greens, yellows and purples. There are a few bottles made for them that are quite scarce today namely the Ocean Weed Heart Remedy which bring hundreds of dollars. Click Mouth-blown Bottles to move to the portion of the Dating key for Mouth-blown bottles new webpage.


If it looks too good to be true, it probably is! The food and household product industries on the other hand widely adopted the screw cap quickly. All turn-mold bottles are round in cross section and unless stained, internet dating services online will usually have a polished looking sheen to the glass surface.

It is a round bottle but you can see two places where it was put togather. The image to the left is a close-up of a bottle with bubbles in atypically high quantity for illustrative purposes. For example, glassblowers still make hand-blown bottles today. More specifically, there appears to have been an increase in the homogeneity and uniformity of glass as the technological advances of the machine era proceeded. Narrow neck press-and-blow machine?

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. The titles of and links to all of the pages contained within this site can be viewed by clicking on Website Map. Beginning collectors often confuse an Owen's ring with a pontil mark and it is easy to see why this happens. Film clip is compliments of the Owens-Illinois Glass Company. This can often lead to enhanced dating refinement of midth century liquor bottle depending on the current information available for the glass maker.

Antique bottle dating

Dating Your Old Bottles

  1. Both of these medicine bottles look much like their earlier counterparts.
  2. The statement was not required on wine or beer bottles, the latter category which was - and to some degree still is - bottled in re-useable bottles.
  3. Is the base indented with an irregular to round pontil scar?

Dating Antique Bottles

They had their own printing department and produced a huge variety of trade cards, almanacs, calendars, speed dating festival d'avignon etc. They will also have other machine-made characteristics as described on the Machine-made Bottles page. Thousands of people ask Digger questions about their bottles. Close up of iron pontil Close up of an open pontil milk base for comparison. Bottle made from manganese dioxide decolorized glass exhibiting a slight lavender cast in the thick portions of the glass.

In the center of the Owens Ring the Owens mark is shown the diamond. Please use the discussion forum for such requests. That is the point of this website. We can always have some indication of a starting date for a technique if we can find who first put the idea into practice. Read through each of the questions to see which have pertinence to the bottle you wish to date.

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. Instead, there is one located near the base of the neck indicating that the neck ring mold portion of the parison mold produced the finish, neck, and a portion of the shoulder. If you know the bottle is a U.

How to Date Antique Glass Bottles

All truely hand blown bottles have an applied lip. The best the following key can do is get a user to a reliably close dating range estimate. Can I open it up and clean it?

How to Date Antique Glass Bottles
Antique bottle dating

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Check for lack of bubbles and uniform glass thickness. Is the bottle machine made and aqua- or light green in color? It is true that the mold seams can be used like a thermometer to determine the approximate age of a bottle. These are faint, somewhat wandering, hairline seams which if present usually are sporadically visible on the sides of machine-made bottles.

Viewers are encouraged, for personal or classroom use, senegal dating to download limited copies of posted material. Ask it on our Discussion forum. You will find that you can quickly train your eye to know a lot about the age of most bottles that you will find. Film clip of an early Owens Automatic Bottle Machine in operation.

Please post over at the forum with a photograph. Both of the pictured bottle bases note such with the script Duraglas on the base. Other information on this website usually must be reviewed to fine tune the information about a specific bottle.

Machine Made Dating

RE Bottle Dating

Guidelines for Determining the Age of Antique Bottles

Note the diagonal line which cuts across the base is obliterated by the Owens Ring the large off-center curcular feature. Post Bottles Do the mold seams go all the way from the base to the lip? Most bottles produced in the past years were formed by blowing molten glass into a mold. As with the mouth-blown bottles, there are a number of other physical attributes of bottles that can variably allow for more precise dating.

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