Helgoland, British territory in the German Bight?

The island of Helgoland currently belongs to the state of Schleswig-Holstein. The island is 1,7 km² in size and has approximately 1.650 permanent residents. During the tourist season, many day-trippers come to visit the island for its nature and the many migratory birds and seabirds from the North Sea region. Another attraction is its enormous red-colored rocks, which rise up to 60 meters above the sea. Helgoland actually consists of two islands. The main island has three areas: the Oberland, the Mittelland, and the Unterland. Only the Oberland and Unterland are inhabited. The second small island is called the Düne and is a sand-covered cliff. But in the past? The name probably meant Holy Land, the dwelling place of the Frisian god Forsite. The current inhabitants still speak a North Frisian dialect. It was in the hands of Denmark. But in 1807, the island was conquered from the Danes by the British. It became British territory from 1814. And naturally, a British postal service was also established. The post office on the island received a postmark with the text: HELIGOLAND. And also their own stamps with that name. The stamps were not printed in England, but in Germany! They were produced in denominations from ½ Shilling up to and including ½ Shilling in 1867 by the State Printing Office in Berlin. And the shilling had nothing to do with the British shilling but with the Hamburg Shilling. The image, however, was British: HM Queen Victoria.    1867    1873 In 1875, the value on the stamps was stated in two denominations, in British Shillings and in German Pfennigs, because the Hamburg Shilling had been withdrawn as of January 1, 1875. In short: Until January 1, 1875: 1 Mark = 16 Hamburg Shillings.   1875     1876 From January 1, 1875: 1 Mark = 100 Pfennigs and British: 1 Shilling = 12 Pence = 48 Farthings. On July 1, 1890, the island was transferred to Germany in exchange for Zanzibar and British rule came to an end. German Emperor Wilhelm II immediately had the island fortified into a fort and turned it into a naval base. It remained so until after the World War II, when the residents were forced to leave the island. The Royal Air Force The island was used for shooting practice, and in 1947 an attempt was made to blow it up. That failed, and in 1952 the original inhabitants were allowed to return to their island. Postage stamps from Heligoland are popular among many collectors. However, one must be careful with these stamps. The print runs of the original stamps are relatively low, and therefore they are quite expensive. Nevertheless, they can be found on the internet at a low price. These are so-called reprints. These reprints occur in large quantities, printed using the original printing plates and brought to market by the Hamburg dealer Goldner. This happened primarily in 1884 to cater to collectors who wanted to fill their pre-printed album pages of Germany and its territories, but could not afford the expensive original stamps. The colors of the reprints differ slightly from the original stamps. It is recommended to have the stamps verified before purchasing them, before adding a cheap reprint to your collection for a lot of money. Do you ever have stamps inspected?