A variation of the Codd stopper. 9 and 1/2" tall aqua. Embossed "Oligana" on one side and "Ilkley Brewery & Aerated Water Company Limited" on the other. Also has "IBCO" on the base and "80" on both sides of the neck. ca late 1800's
Photos and info courtesy of xsellr8(David). Much thanks.