![]() Many, many types of commonly-seen glass products have been marked with these types of mold numbers on the base, including bottles, fruit jars, jugs, flasks, candle holders, candlesticks, ashtrays, canisters, dishes, mugs, sugar bowls, salt and pepper shakers, sugar shakers, syrup pitchers, tumblers, tea glasses, punch cups, etc. (If problems occur with the finished product, it can be easily ascertained which mold or mold section is at fault.) If a number of identical bottle molds are being used simultaneously, each mold would be assigned a number. Probably in the majority of cases, single or double-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, jar or other glass item. In these cases, the general style, shape, glass color and other characteristics may help narrow down the possible age range of a particular specimen.Ī large percentage of bottles are marked with only a number, or numbers, on the base (or the heel), and the truth is that, in many cases, it is very difficult, if not impossible to assign a specific glass manufacturer to a bottle if there is no other informationembossed in the glass. ![]() In many cases there is NO such mark, with only a number or numbers to be seen. Often, a trademark or other marking is embossed on the very bottom of the bottle, or along the lower “heel” of the bottle. Īlways look very closely over the entire glass bottle or other container to see if there is a logo (emblem, trademark, initials, or just a letter) visible that might be a mark that identifies the actual glass manufacturer. ![]() The number (within a triangle with rounded corners) found on the bottom of plastic bottles is a code indicating the type of plastic the bottle is made from, and pertains to the subject of recycling). (NOTE: the article on this page is pertaining to GLASS containers, and does not apply to the subject of modern / recent PLASTIC containers, which is an entirely separate field of study, and is discussed on many other websites. Unfortunately, there is no “one answer fits all” to this question!! Collectors and others are interested in understanding what the number markings on the bottoms of glass containers indicate. I frequently receive inquiries about the interpretation of various numbers seen on the bases of glass bottles.
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