A 1-quart divided serving dish with matching lid in the "Butterfly Gold" pattern from Pyrex.  The dish measures 12 3/4" long with the lid and 8 1/2" across.  The lid is impressed with "Pyrex" and the bottom of the dish is impressed with "1 Quart Pyrex Made in USA For Oven Baking Only 16."  The condition of both the top and bottom pieces is pristine, with no chips, cracks, stains, scratches to the graphics, or hint of use.

Corning Glass Works and Pyrex

From Wikipedia:  Pyrex was created in 1915 when chemists at Corning Glass Works invented a new kind of borosilicate glass that could withstand extreme temperature fluctuations.  Soon after, popular over-to-table-to-refrigerator household kitchenware was introduced.  The continued popularity of Pyrex over the years saw the creation of nested and Cinderella mixing bowls, casseroles, divided servers, refrigerator sets, carafes, and dinnerware (to name a few) in bright colors and lively patterns.