Wilton Columbia pewter bowl. It's like a seashell... Like ripples... A beautiful pewter bowl. It's called a scallop (scallop shell) pewter bowl. Diameter: Approximately 18 cm Bottom diameter: 11 cm Height: 6 cm, approximately The stamp on the bottom is clear. I bought it in Canada about 20 years ago. It has been stored at home, so there is some dullness and dirt. I don't know how to polish it, so I only washed it with water. Please understand the above.