Set of six Art Deco napkin rings in marbleized rainbow shades of blue, green, pink, purple and red. They look like bakelite, but they are celluloid or a similar composition. The remain in their original fitted box. The top is imprinted "Birmite Regd." Origin: probably English, circa 1930. Condition: napkin rings are excellent; box has tears at the corners. Size: 9/16" wide; 1-3/4" diam.