Being embossed rather than incised, and the material being glass, it is obviously molded in rather than stamped. The following are general representations of the various backstamps, which may not look exactly the same on all shapes. Promotional patterns may have been available for as little as a holiday season or a year, standard patterns from two years to as long as a decade in a few instances.The early clear glass Pyrex ware backstamp was a simple circle with PYREX in an all-caps serif font with Corning Glassworks' CG monogram above and below. The backstamp on the earliest color ware included the word PYREX with the abbreviation T. Other Considerations The earliest colored nesting mixing bowls have a deep base ring, the bases on later ones being almost flat by comparison.
The CG monogram is often mistaken for and referred to by collectors as a dollar sign, albeit a backwards one. Sometime in the 1960s, the circular configuration of backstamps gave way to a more straight text format consisting of PYREX ® in larger letters with model and capacity information in smaller characters above, and MADE IN U. On many pieces, various numbers and sometimes letters are seen in and around the backstamp.
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.
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In 1882 he bought the Royal Copenhagen Porcelain Manufactory and the two companies merged to one.
The production of faience lived its own quite life in the shadow of the blooming interest for industrial production of porcelain at Royal Copenhagen.
In the Collector's Guide by Caroline & Nick Pope you will find a list of the known painters with number-signature and their working period at Royal Copenhagen.
Also the data of the designing artist will be an important indication of possible age.
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