It is a Burroughs and Mountford Co. mark. The book- "Marks of American Potters" by Edwin Atlee Barber states that the Crown mark with the initials of the firm were used on various grades of white granite and C.C. wares with printed decorations. The Burroughs & Mountford Co. began business in Trenton in 1879, in the Eagle Pottery, erected in 1876 by Richard Millington. They produced a large line of table and toilet wares and a number of characteristic styles of art wares, in bold ornamentation and harmonious coloring. Some of their larger vases, painted by a Japanese artist in their employ, were among the finest pieces of the kind ever produced in this country. They were in business until sometime around 1895 or before.