VTG RARE STEUBENVILLE PLATTER

Must be RARE as I cannot find anywhere. After searching for days, I found someone had this pattern but not platter. They also did not know name of pattern. Definitely VTG and at least 20+ years old. Came from family member estate. Ivory Rectangle Serving Platter. Yellow Floral with Green Leaves and Vines. Also Blue Accent Flowers. Has some discoloring due to age I assume. Will probably come out with Comet but I didnt want to risk it. Glaze is still intact. Approx 14.7" L x 11" W x 2" Deep