Reichsbank. German state. Reichsbanknote. 1. September 1923. Overprint.

. 1000 Mark. 15. Dezember 1922.

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2.1. no, it isn't.

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3.1. More information about Reichsbanknote. 1 Milliarde Mark. 1. September 1923., see the link: Reichsbanknote. 1 Milliarde Mark. 1. September 1923.