Check the bottom of the bottle for what is known as a pontil mark. This will be a ring or area of rough glass from where a supporting rod held the bottle during glass blowing and definitively dates the glass as being vintage.

What are the numbers on the bottom of glass bottles?

Many bottles have numbers on the base. These marks can be used to identify a mold in a glass factory. A number of the same molds would be serially numbered, such as 1 to 12.

How do you tell the difference between cut glass and pressed glass?

Cut glass will have sharper detail with a more defined pattern, whereas pressed glass will be smoother and worn to the touch. Look for mold marks. Cut glass will not have any mold marks and most pressed pieces do unless they are upper end pieces where someone took the time to remove them.

Are glass bottles worth money?

California Redemption Value Most beverages packaged in aluminum, glass, plastic and bi-metal containers are eligible for CRV. CRV is 5 cents for each beverage container less than 24 ounces and 10 cents for each container 24 ounces or greater.

What is the difference between carnival glass and Depression glass?

Both carnival and depression glass are colored. However, carnival glass features an iridescent, multicolored look, whereas depression glass has more of a simple, single-colored, transparent look. Carnival glass was made to inexpensively mimic glass made by the Tiffany Company.