1923 AD., Germany, Weimar Republic, Reichsbank, Berlin, 7th issue, 1000000000 Mark, unknown printer J, Pick 113a/2. 12 J·356473 Obverse

State: Germany, Weimar Republic
Issuer: Reichsbank
Location of issue: Berlin
Date of issue: September 1923 AD., 7th issue,
Value: 1.000.000.000 Mark
Size: 140 x 90 mm
Material: paper brown paper
Watermark: 1000 M (only on brown side, otherwise none)
Serial : 12 J·356473
Serial no. : 6 digit green serial
green Company logo: J (all observed: A, AD, AE, AF, B, C, D, E, F, G, H, J, K, M, P, S )
Signatures: (12)
Privately printed, unknown printer J
Obv.: Eine Milliarde Mark / 12 J·356473 / Reichsbanknote / Eintausend …. , portrait of mintmaster Jörg Herz (from a painting by Georg Penz), corrected value in red transverse letters across old print and to r.
Rev.: Eine Milliarde Mark / Reichsbanknote / R·B·D / 1000 / Mark / Wer Banknoten nachmacht …. , value and text in square ornamental design, denomination "1000" within, corrected value in red transverse letters across old print.
References: World Paper Money, Pick 113a/2 ; Rosenberg R-110b .

Pencz (Benntz, Bentz, Benz, Pens, Pentz, Penz, Prenntz), Georg (Jörg, Jorg) : https://www.deutsche-biographie.de/sfz94547.html

The portrait is of mintmaster Jörg Herz and comes from a painting by Georg Penz, who lived in Nürnberg during the first half of the 16th century. (Karlsruhe, Staatl. Kunsthalle, Germany)

For December 1922, the Reichsbank Directorate had commissioned a new 1000 mark bill. At the time of it´s issue, 1000 Marks were worth only 1/8 dollar. So the issue was cancelled. In September 1923, when banknotes of 1 billion marks were urgently needed, they remembered these old notes and simply stamped them 1 billion marks. Without a new date, the notes were finally put on the market after the announcement of 21 September 1923. At that time, one billion marks still amounted to $ 6.25. Once again it happened to the Reichsbank that the planning of a new issue fell into the water: a bill of 5,000 marks of March 15, 1923, was issued only in October of the same year with the overprint of 500 billion marks.