EXTREMELY RARE GERMAN WWII POST, U-BOAT U-143, 1941
German WWII post from U-Boat U-143, dated 1941. The letter has a status of TOP SECRET (Geheime Post) and was sent from headquarters to the commander of U-Boat U-143, Kapitanleutnant Mannsek. The envelope contains five rare stamps, and inside the envelope, there is a brown paper. Additionally, you can see the registration number from the archive, written in red (number 185), along with two holes, indicating the post was in an archive folder. The images confirm that during that period (27.12.1941), Kapitanleutnant Mannsek served as the commander of U-Boat U-143.
DIMENSIONS: 160 x 90 mm.
TEST: This particular item has passed a very important test: it does not glow under a black lamp. (Note that all paper made after 1945 typically glows under black light). Please refer to the images for further details.
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WIKIPEDIA: During World War II, U-boat warfare was the major component of the Battle of the Atlantic, which lasted the duration of the war. Germany had the largest submarine fleet of the revived German War Navy (Kriegsmarine) from 1935 into World War II (1939-1945), since the Armistice of November 11th, 1918 scuttled most of the old Imperial German Navy from the First World War and the following Treaty of Versailles of 1919. This limited the surface navy of Germany's new Weimar Republic to only six battleships (of less than 10,000 tons each), six cruisers, and 12 destroyers. British Prime Minister Winston Churchill later wrote "The only thing that really frightened me during the war was the U-boat peril".

WIKIPEDIA: Feldpost is the German military mail service. Its history dates back to the 18th century in the Kingdom of Prussia during the Seven Years War and War of the Bavarian Succession and has existed ever since in different forms and shapes. During 1937-39, the German Wehrmacht had a military mailing service that provided free postal services within Germany. On September 3, 1939, the first changes to the service occurred. Postcards and letters up to 250 g including newspapers could be mail free of charge by the German para-military and military organizations. Later in 1939, packages weighing up to 1,000 g were included at the nominal rate of 20 Reichspfennig fee. All German military branches had its own organic postal administration in charge of receiving and delivering mail. For Feldpost offices closest to the combat zone a mobile facility usually processed mail for all military branches.

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