Vintage Roseville, Ohio Pottery R.R.P. Co USA Blue Spongeware Heavy Earthenware Mug Beautifully crafted vintage blue spongeware earthenware coffee mug. The impression carved onto the bottom reads: Roseville, Ohio R.R.P. Co. USA. This is a well-made, thick, heavy piece of vintage pottery. Measures 4” tall with a 3.5” diameter; 5” across including handle. Holds 11 fluid oz. Bundle with other items in my closet for automatic discounts and to save on combined shipping. If you’re new to Poshmark - Welcome! Use our sign up code GLOBALSANDRA to create a Poshmark account and get $10 off your first purchase.