Vintage Primitive RRP Co. Stoneware Blue Spongeware Custard Cup. Love stoneware of all kinds for decorating. Display with other stoneware bowls, crocks and pitchers. Custard cup. Great shape, no chips or cracks. marked on the bottom. Size is 3 1/2" x 3" . Bottom marked RRP Co. USA Roseville. I have 1 of these in stock.