Iridescent Favrile glass box, with six panels of curved glass on the sides, and an iridescent glass panel on the lid and bottom. Base stamped and with the TIFFANY FURNACES insignia, and numbered: 109. Height: 2". Diameter: 4-1/2".
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Reference:
Loring, John. Louis Comfort Tiffany at Tiffany & Company. Harry Abrams Publishers, NY. 2002. p.207 (similar examples).