Stort porterglas 7/20 literHeight 17 cm. Large beer glass from the beginning of the 20th century with the measurement 7 20 l iter. It is mouth blown with clear grooves from the glassmaker's rod and a large sand nail at the bottom. The edge is cut and heated. 7 20 liters corresponds to 350ml, so it can be assumed that the glass is after 1907 when Denmark switched to metric units of measurement.