During the period when Heligoland was a British possession, about 20 postage stamps were issued between 1867 and 1890. There were up to eight printings of a single denomination and also a large volume of reprints which are known as the Berlin, Leipzig and Hamburg Reprints, respectively. The Berlin reprints are sometimes better quality than the originals. The reprints were done between 1875 and 1895. Consequently, many "old" collections contain reprints rather than originals. Some believe there were seven million reprints as compared to the known 1½ million originals, of which perhaps half were sold through the post office and the remainder sold to dealers when withdrawn from use. A few printings were never postally sold but nevertheless found their way into the hands of dealers. The stamps were printed by the Prussian State Printing Office in Berlin. They were denominated in the Hamburg Schilling until 1875, when both German Reich and British values appeared on each stamp issue. All are embossed with a silhouette of Queen Victoria excepting the four highest values which represent Heligoland escutcheons.