Vintage Roseville RRP Pottery Roseville Ohio Blue Spongeware Coffee Mug. Love the sponge ware look on stoneware. Each mug is bottom marked: RRP Roseville USA Ohio. Size is 3 1/4" diameter x 4" High x 5 1/4" wide with handle. Drink your favorite hot beverage in style with these mugs! Only 2 Available! Packaged carefully for shipment.