The notched/toothed ring on the foot is similar to a definite Wfrs. bowl in recent months, so I'm hoping this is the same, and the 'wave pattern' is very much like the pieces shown in Leslie Jackson's book. Diameter is 12.5/8 inches across the top, and it rings with that intense sharp metalic sound that goes on forever. There is wear on the base, although perhaps not as much as I might have expected, and the pontil mark has been ground and polished well. Would appreciate an experts opinion please, and thanks for looking.