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Backstamps On the bottom of most every genuine Pyrex opalware article is an embossed set of markings which contains a variety of information. The backstamp seen on various items prior to that echoes a Mac Beth-Evans trademark, but one not previously used on their glassware: that of a glassblower, or "gaffer", nicknamed "Little Joe". Since pattern collections and promotional pieces were available for relatively finite periods, knowing their years of introduction and discontinuance can also help narrow down dating somewhat.

While technically a trademark, it is most often seen referred to as a backstamp. The configuration of the backstamp would undergo a few revisions after the introduction of opal glass kitchenware in 1945. A listing of patterns by year of introduction can be found .

Bowls are one of the most common cooking tools in a kitchen, which is why we probably take them for granted.

But ask any good cook if there’s a non-electronic item in his or her kitchen that they simply could not do without and you might learn that it’s a favorite mixing bowl—chips, scratches, and all.

By 1900, Revere & Son had merged with the Taunton-New Bedford Copper Company, located in New-Bedford, Massachusetts.

A revised backstamp, with PATENTED above PYREX and MAY 27, 1919 below, was used after that date through 1924. A model number and the capacity in pints or quarts were added above, and OVEN WARE below. Later pieces are also recognizable by, instead of "MADE IN U. A.", the the wording "by CORNING, Corning, NY, USA" with the verbiage NO BROILER OR STOVETOP or, later, BAKING AND MICROWAVE below.

Between the 1920s and 1940s, one ceramics company, Mc Coy, embossed and molded its bowls with more details than its predecessors.

Mc Coy also broke the genre’s predisposition for yellow by glazing its bowls in a range of soft-to-deep greens.

The first aluminum cookware was introduced in 1892 by Pitsburgh Reduction Company (later renamed ALCOA).

Revere’s early products included skillets with heavy copper bodies, straight sides, and flat uninsulated iron handles.