This US COAST GUARD officer's sword dates to the years of the inception of the service, ca.1915-1925, and was manufactured by M.C. LILLEY & CO., in Columbus, Ohio. According to the WWI period M.C.Lilley sales catalog, this was their more expensive, deluxe model, with real shark skin on the grip, hand-chased bronze details of the hilt and the scabbard, and with the scabbard being of a metal wrapped in black leather.
Sword shows signs of honest wear to the blade and gilding of the bronze; leather is long gone from the scabbard.
USCG abbreviation is displayed on the guard and the blade, which is 28"/71 cm long, otherwise this sword is a twin of the US Navy officer's M1852 swords.
A nice early US Coast Guard officer's sword dating back to World War I period, or thereabout