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Craig, your "egg cooker" is called a "Go Along" and was sold along with Homer Laughlin Co. Fiesta ware and other lines. It is actually called an Egg Poacher. You have the wrong lid; it should be the same color as the base.
In my book, dated 1987, 6th Edition by Huxford, its value then was $40-45. Today? No idea.
That it was teamed with Fiesta makes it much more valuable.
Tom it is long ago sold