Cased Set of English Sterling Napkin Rings, 1921

This is a really neat set of six sterling napkin rings in a fitted box. They are all fully hallmarked for J. Dixon & Son (well renowned firm of silversmiths, going back to the Victorian era), Sheffield 1921. Each bears a family crest and each is numbered 1-6. Excellent condition throughout. Each is 1" wide, 1.75" in diameter.