The piece measures just under approximately 1 and 9/16 inches high, including the bale, by about 1 and 1/8 inches wide, and just over approximately 3/8 of an inch, or about 10 millimeters, thick. The bale opening is just under roughly 3/16 of an inch, or about 4.5 millimeters, wide. (Included you'' see a US Quarter in the photographs, for the measurement-challenged and ruler-averse.) Stamped on the back, "925", unsigned. Weight approximately 4.57 grams.
This pendant is in very nice vintage condition, though it will have the expected light surface scratches and dings to the silver from normal wear. Hand polished, but it may need further attention.
A very pretty, large but feminine and curvy, vintage Sterling silver scallop shell pendant. A wonderful reflection of natures beauty.