This is a Aqua Thomson & Co. blob-top mineral water works bottle...Crystal Springs....Dunedin. The back reads: Trademark Purity Registered with a cross over it. The bottom is marked 1900. It measures 9 1/4" tall and has a top diameter of 1 3/8" and bottom diameter of 2 1/4". There is a small crack in the neck top.
Aqua - Thomson & Co Blob-Top Mineral Water Works Bottle - Crystal Springs - Dunedin