Belleek is a thin, ivory-colored, almost iridescent-type porcelain. It was first made in 1857 in county Fermanagh, Ireland. Production continued until World War I, was discontinued for a period of time, and then resumed.
Shamrock is the most commonly found pattern, but many patterns were made, including Limpet, Tridacna, and Grasses. Pieces made after 1891 have the word “Ireland” or “Eire” in their mark. Some are marked “Belleek Co., Fermanagh.”
The following abbreviations have been used to identify marks:
1BM = 1st Black Mark (1863–1890)
2BM = 2nd Black Mark (1891–1926)
3BM = 3rd Black Mark (1926–1946)
4GM = 4th Green Mark (1946–1955)
5GM = 5th Green Mark (1955–1965)
6 G M = 6th Green Mark (1965–c1980)
B / G M= Brown/Gold Mark (1980–present)
References: Susan and Al Bagdade, “Warman’s English & Continental Pottery & Porcelain, 3rd Edition,” Krause Publications, 1998; Richard K. Degenhardt, “Belleek: The Complete Collector’s Guide and Illustrated Reference, Second Edition,” Wallace-Homestead, Krause Publications, 1993.
— Harry L. Rinker
“Official Price Guide to Collectibles”