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Look for it above the trademark on bowls and dishes, and on the handles or rims of lids.Below is a listing of model numbers of the most often-seen pieces of vintage Pyrex kitchenware, which may be helpful for identification purposes.In 1885 Charles Dow compiled a single average of 14 stocks consisting of 2 industrial and 12 rail-road companies.
Not all of the major companies dated their vintage sewing patterns in the same way.
Model numbers are also useful in that they provide collectors with a common language, a frame of reference, and even a shorthand when speaking about Pyrex ware.
Each shape and size of Pyrex Ware was assigned a model number, which is typically embossed somewhere on the piece.
Want to know if the digits in a date are sequential, repetitive, or can be read the same way forwards and backwards?
Use the Date Pattern Calculator to find out unique and interesting mathematical patterns in different date formats. For more options including pattern type, date order and to include time select the Advanced options checkbox.
In parentheses after each are the lid numbers which fit the corresponding dish or bowl.