Volumetric flask

Glass flask, volumetric flask, 100mL. Made by Wood Bros, Barnsley, England.Date of manufacture 1923. "320" inscribed near to mouth of flask. Wood Bros logo appears on neck. Below that is inscribed "NPL" in merged letters, "23". "C.1" inscribed just below the fill line. On the bulb of flask are etched "100.C.C." and "15oC".