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|Country|| Weimar Republic (1919-1933)
Nazi Germany (1933-1935)
|War Ensign (1933–1935)|
|War Ensign (1921–1933)|
|War Ensign (1919–1921) never used|
The Reichsmarine (English: Imperial Navy) was the name of the German Navy during the Weimar Republic and first two years of Nazi Germany. It was the naval branch of the Reichswehr, existing from 1919 to 1935. In 1935, it became the Kriegsmarine, a branch of the Wehrmacht; a change implemented by Adolf Hitler.
Vorläufige Reichsmarine 
The provisions of the Versailles Treaty restricted the German navy to 15,000 men and no submarines, while the fleet was limited to six pre-dreadnought battleships, six cruisers and 12 destroyers. Replacements for the outdated battleships were restricted to a maximum size of 10,000 tons.
Extent and equipment 
The Treaty of Versailles limited the size and armament of the Reichsmarine and prevented it from introducing new technologies. The restrictions were intended to prevent the German navy from becoming a threat to the Allied powers. On the other hand, the Allies had made certain that the Reichsmarine would be in the foreseeable future the strongest power in the Baltic Sea, in order to serve as a counterweight against the new Soviet Union, which was viewed with distrust by the Allies.
Germany was only allowed six battleships, six cruisers, twelve destroyers, and twelve torpedo boats. The Reichsmarine tried to meet the arms restrictions with secret armament and technical innovations such as the introduction of the pocket battle ship. The legal weight limit for the ships were 35,000 tons.
List of Reichsmarine ships:
- Deutschland class battleships
- Braunschweig class battleship
- Bremen-class cruiser
- SMS Berlin (1906-1929)
- Gazelle class cruisers (3,033 tons, 10 × 1 - 105 mm (4.1 in) guns)
- Emden class cruisers (6,000 tons, 8 x 150 mm guns)
- Emden (1925-1945)
- K class cruisers (7,200 tons, 9 x 150 mm guns)
- Leipzig class cruisers (8,000 tons, 9 x 150 mm guns)
- Deutschland class cruiser (10,800 tons, 6 x 280 mm triple guns)
- Radio-controlled target ship
- Zähringen (1902-1945)
- Raymond C. Watson Jr.. Radar Origins Worldwide: History of Its Evolution in 13 Nations Through World War II. Trafford Publishing, 2009. Pp. 229. Describes the meaning of Reichsmarine as "Realm Navy".