For items of similar enamel and diamond execution see: The Swan Egg, probably presented by Nicholas II to his wife, Alexandra Feodorovna in 1906 (From the Collection of the Late Maurice Sandoz, Museé de l'Horlogerie, Le Locle, Switzerland); a cushion-shaped mauve enamelled bonbonnière, by Henrik Wigstrom, New York, A la Vieille Russie, Fabergé, (22 April - 21 May, 1983) p. 66, no. 155; and a belt-buckle (incorrectly described as a frame) also by Wigstrom, Russian silver of the XIV to early XX centuries from the Moscow Kremlin reserve, p. 191