In 1970, Corning launched an assortment of new 3 Pc. Bake Ware Sets in a variety of patterns. The sets included a loaf pan (913), square pan (922), and oblong pan (933). One of the new sets was called "Earth Tones" in dealer announcements. Although the announcement photo shows pans with rounded corners, the new bake ware sets actually had sharply angled corners. 

Although called Earth Tones in the dealer announcement, the set was actually shown with the Early American pattern in the 1970 Dealer Catalog, with no reference to the name, "Earth Tones." Adding to the confusion, boxes for the set were labeled "Brown" rather than Earth Tones or Early American. The reference to “Brown” is somewhat misleading since the 3 Pc. Bake Ware Set contains a loaf pan in solid beige, square pan in solid burnt orange, and oblong pan in solid rust. 

Adding to the mystery is the 4 Pc. Mixing Bowl Set in similar colors. The mixing bowls are hard to find, indicating they were likely produced as a test item, special promotion, or limited edition set. Their exact date of production is unknown. The Mixing Bowls did not appear in dealer catalogs and were likely produced a few years later based on their back stamps. 

Curiously, the three smaller bowls (401, 402, 403) have the newer, square PYREX micro-wave stamp on the bottom whereas the large 4 Qt bowl has the older, round stamp. The mixing bowls alternate solid rust (401, 403) and burnt orange (402, 404). 

The box for the mixing bowl set was unlabeled and unmarked, with the exception of a stamp that read “400 CRS.” The "400" was in reference to the 400-Series Set (401, 402, 403, 404), but the significance of "CRS" is unclear. A recently found new-in-box set also had a price tag which read, "Corning Glass Center $5.00" indicating this particular set was sold directly in the Corning Glass Center Shop. 

The Cosmopolitan Promotional item is a favorite for collectors due to its innovative design and mysterious origins. The casserole is sometimes referred to as the "bulls eye" due to the design.

The casserole (475 2 1/2 Qt Round Casserole) is curious in that some versions have the familiar PYREX stamp on the bottom while others are marked "Salton." 

The Salton version of the casserole was manufactured by Corning Glass Works for Salton, Inc. as part of the Cosmopolitan Hot Casserole Set. The set included the casserole and a a square warmer (Model No. H-109C). Salton was a popular manufacturer of hot plates and food warmers during the 1960s and 1970s. When sold as part of the Salton set, the casserole is typically stamped "Salton" on the bottom. 

A recently acquired Salton set, which included the box, revealed the date of manufacture as 1973. The date was stamped on the bottom of the box as the production date. 

The casseroles marked "PYREX" may have been sold separately by Corning, rather than Salton during the same time period, although this is speculation.