In many cases (especially within just the last few years, writing this as of 2013), mold data information is now preserved through the use of small embossed “dots”, “bumps” or raised periods arranged horizontally around the lower heel of the container.More information on this invention (which is rather involved!
Date codes are often seen, especially on soda bottles from the 1930s to date, and many of these codes are embossed on the base of the bottle, placed to the right of the glassmaker’s logo. These date codes are not always obvious, or easy to distinguish from mold numbers.It also depends on exactly which glass company produced the container, as all firms do not use the same system of markings.(If problems occur with the finished product, it can be easily ascertained which mold or mold section is at fault.) Numbers also serve other purposes, depending on the exact container and/or company being discussed. Some numbers (for instance, 3- or 4-digit numbers on the base of many British bottles) are catalog, inventory, style or design numbers assigned to a particular bottle shape.Those numbers would serve to identify a particular bottle style, such as in communications/orders between the glass manufacturer and their customers ……is, the companies who ordered the bottles to package their products.Search google with that phrase for a webpage that lists many of the permit numbers assigned and used by many glass companies.
Many whiskey bottles are seen with “D-numbers” on the bottom which are distillery identification codes.
In these cases, the general style, shape, glass color and other characteristics may help narrow down the possible age range of a particular specimen.
A large percentage of bottles are marked with only a number, or numbers, on the base (or the heel), and the truth is that, in embossed in the glass.
Prices for goods and services, on average, haven’t increased enough to affect the COLA.
Other changes that would normally take effect based on changes in the national average wage index also won’t begin in January 2016.
Probably in the majority of cases, single digit numbers are mold numbers, merely serving to identify a particular mold, (or section/mold cavity in an automatic bottle manufacturing machine) that was used to form the bottle or other glass item.