Two Brass Ship's Steam Whistles, together with a three-note brass ship's whistle with valve and a brass ship's siren with valve
height of whistles 68 in., 42 in, 15 in.; height of siren 19 in.
173 cm, 107 cm, 37.5 cm; 48 cm
Christie's Amsterdam, Maritime Sale, September 9, 1997, lot 71