This is a vintage replacement lid made by Pyrex.
The lid is clear and features a glass material, a rectangular shape, and a knob on top.
It measures approximately 2" tall, 7.5" wide on the outside, 6.5" wide on the inside of the lip, 6" deep on the outside, and 5" deep on the inside of the lip.
The lid comes in good pre-owned condition with a chip on the inside of the lip, scratches, and stains.