This is a Hartley Greens & Co. Leeds Pottery creamware teapot, the "Creamware Solid" Pattern, crafted in England and marked on the base with both a printed stamp and embossed Leeds Pottery name. 

Measuring approximately 8-1/2 inches (21.6 cm) in width including handle, 5.25 inches (13.3 cm) in height, and a 4-7/8 inch (12.3 cm) circumference, and measurements have been verified for accuracy, it exemplifies the refined artistry of Leeds creamware with its glossy ivory glaze and sculptural detailing.  The teapot it estimated to hold about 24 ounces.