This is a mystery piece of glass (for me anyway). This crystal clear glass dish measures 8″ in diameter and 1 1/4″ deep. As you can see from the pictures it has a scalloped edge and it has a raised graduating glass bead design on the underside the creates sort of a spiral pattern when viewed from above. It has no markings that I can find. Anyone recognize the pattern or know the manufacturer? As always, thank you in advance for your time.