All handmade glass marbles have at least one pontil mark on them. This mark shows where the creator broke the marble off the rod during its creation. Some creators leave the pontil as it is, while others attempt to grind or melt it down to hide its appearance. Knowing the characteristics of the different pontil marks allows you to identify which type of marble you have and tell handmade marbles from those made with a machine 1. Feel along the marble until you locate a rough spot.
By the midth century, embossed lettering and marking on bottle bodies and bases, denoting manufacturers and products, made more precise dating possible. In addition to technology, products and manufacturers, certain types of glass colors will also aid in dating.
Pontil marks are rounder and do not follow a pattern. Feel the pontil mark, and determine how rough it is. Round pontil marks with a slightly rough texture that are still fairly smooth indicate what is known as a ground pontil mark, according to Akron Marbles 1. After the marble was made, the creator ground the pontil mark down to create the. Glass tipped, blowpipe, and sand pontil marks may all be found on most all bottles dating well before the period covered by this website, i.e. before the early 19th century, and continued to be common on a large majority of bottles up until the American Civil War. Mar 29, Pontil marks might look like a chip in the glass, a bumpy lump, or a dimple in the bottom of the glass. Fenton has created some offhand glass pieces which do have a pontil mark. These include some very rare pieces from the s and a few contemporary hand blown collections. 2. Purchase a collector's book or find a Fenton glassware catalogue.
Look for mold seams. The earliest bottles were hand-blown by a glassblower with a blowpipe and lack seams.
Is the bottle highly symmetrical, but lacking mold seams? This type of bottle was probably dip-molded and dates after circa Is the base indented with an irregular to round pontil scar?
More specifically, glass tipped, blowpipe, and sand pontil marks may all be found on most all bottles dating well before bottles were even made in any quantity in the New World, i.e. before the late 18th century, and continued to be common on a large majority of bottles up until the American Civil War. Iron Pontil- Pontil- pre s (excluding barber bottles and specialty glass) Screw Capup (excluding fruit jars and specialty bottles) common standard practice after Stoneware- before Tooled Top- Whittle Marks- before PEASE NOTE: . Blenko marks. Eureka Art Glass Co.- These can only be found on stained glass and rondels. This is the paper label used for a short time during WWII. Then they went back to the Foil label. Silver Hand Sticker - Used from the s to Left over stickers were used until they were gone.
This, and no mold seams, is another indication of a hand-blown bottle. A pontil rod held the nearly molten bottle during the final stages of manufacture.
The scar was left when the pontil was detached from the bottle. Look for side mold seams.
If the seams disappear in the neck, the bottle was probably "blown-in-mold" and dates circa to early s. Is a pontil mark present along with disappearing side mold seams? This bottle probably dates circa to Do the mold seams disappear in the neck, but the bottle lacks a pontil mark?
Blown-in-mold bottles without pontil marks date circa s to s. Do the mold seams go all the way from the base to the lip? Determine how rough the area feels, and examine it to see what types of marks appear and what they look like.
If the marble is completely smooth, it was machine made and has no pontil marks.
Check for smooth lines or a single straight line that runs deep into the marble. Lines like this as well as smooth indents or bubbles do not indicate pontil marks found on handmade marbles.
Dating antique bottles requires knowledge of the evolution of bottle technology and the ability to research manufacturers and bottling companies. Although glass bottles have been made for a few thousand years, it was not until the 19th century that bottle use became . Check for a rough mark on the base of the glass. This the pontil mark, left from where a rod was affixed to the bottom of a piece of molten glass after the base has been shaped. The pontil mark on Blenko glass is usually unpolished, and may still feel rough, or even sharp. Types of Pontil Marks. Here are a few examples including an iron pontil, open pontil, ground pontil and pontil mark on a contemporary pitcher. A classic well-defined ring pontil or open pontil mark. The pontil rod was sheared off at this point after the glassblowers finished forming the lip of the bottle.
They are shear lines caused by machines and are not true pontil marks. Examine the pontil marks that appear to be real.
These lines are typically rough and extend out in a ripple-like pattern. Shear lines may appear rough depending on the machine that created them, but they will run along the marble in thin lines that look like cracks in glass.
NOTE: This is the end of the key for pontil-marked bottles as the remaining questions deal with post-Civil War era bottles and do not add any further dating refinement. For more information and dating information on pontil marks it is highly recommended that a user review the Pontil Marks or Scars page.
Pontil marks are rounder and do not follow a pattern. Left over stickers were used until they were gone.
Hand signed Blenko - Used in early All of these were personally done by William Blenko, Jr. All hand etches can only be found on designs.
Sandblasted Blenko - Used from the Spring of to Summer of Don Shepherd signature found only on designer lines that were hand signed.
If anyone has this stamp on another piece feel free to email us a photo. Blenko New Sandblasted Signature - Starting in July Blenko has a new sandblasted signature which includes the date of manufacture. It is smaller than the older sandblasted.
This label was designed by John Nickerson. The orange ball represents the hot glass ball on the end of the blow pipe.