However with years in sunlight this compound itself changes and gradually turns the glass amethyst or purple.All these bottles are embossed “The property of Penfolds Wines Ltd” in some form near the base and then variously have “Penfold” or “Penfolds” at the other base edge and/or shoulder.I won’t delve into the history of Penfolds as there are plenty of resources online already dealing with the subject, e.g. Most collectable Penfolds bottles date to the 1910s-1920s (except of course that many Penfolds wines such as Grange are themselves collectables! Claret shape: Penfolds were predominately a fortified wine producer in the early 20th century but these bottles would have contained table wines. The clear glass bottles contained whites and the darker green or amber bottles the reds.The amethyst bottle in the middle would have started out as clear glass but Manganese Dioxide was widely used as an additive in glass to remove the green tinge and create truly clear glass.If you're unable to read it, try placing a piece of white paper on the bottle and lightly rubbing over the mark with a piece of charcoal or a crayon. Some markings demonstrate how the bottle was manufactured, and by extension, its age.After you've found the mark on the bottle, classify it by type. Pontil marks typically indicate an older bottle, and older bottles are sometimes more valuable.From the standpoint of most collectors of antique bottles, the name and location of the company the bottle was made for, and the name of the product that was originally contained in the bottle (one or both of which may be embossed on the bottle) is often considered to be of more interest or importance than the glass factory where the bottle was actually manufactured.However, this site is geared with more emphasis on the actual themselves.
These markings are the key to telling a fake from a find and to determining the age and value of your bottle.
The amber bottle on the right is close to a modern day style and dates to about 1930.
Fortifieds: Like the Claret shapes these come in a range of colours (by the way I’ve only shown a small selection of both types). Note that the two bottles to the left have the same base mark which shows the mould for these was made in 1917.
Hopefully this database will be of some help to those who are attempting to assign an approximate date range to a particular bottle, assuming it carries an identifiable glass manufacturer’s mark. Co.” Also, the abbreviation “Co” (Company) sometimes may be found embossed with either an upper- or lower-case “O” on various bottles made by the same manufacturer.
be a glass manufacturer’s mark and so may not be listed here. Many bottles carry only a number (or numbers) on the base.
Still working on updates for the other pages, if your interested in bottles or insulators and not sure what's for sale please ask.