C. F. Monroe Brass-Collared Puffy Wave Crest Opal Glass Ferner, fourth quarter 19th century, of square form, the liner lacking, signed on the base, h. 3-3/4", w. 7", d. 7". For a nearly identical ferner, see W. R. Cohen, Wave Crest, The Glass of C. F. Monroe, Collector Books, 1987, p. 24, upper photograph. C. F. Monroe Brass-Collared Puffy Wave Crest Opal Glass Ferner, fourth quarter 19th century, of square form, the liner lacking, signed on the base, h. 3-3/4", w. 7", d. 7". For a nearly identical ferner, see W. R. Cohen, Wave Crest, The Glass of C. F. Monroe, Collector Books, 1987, p. 24, upper photograph.