Mark (Mk or ℳ), retrospectively also Goldmark, was the unit of account and the coin denomination of the one-third gold-backed currency of the German Empire from 1871 (“Reichsgoldwährung”). It was the valid currency following the resolution of 4 December 1871, the first Imperial Coinage Act. In August 1914, with the beginning of the First World War, the issue of gold coins denominated in marks by the public treasury was discontinued.
Inflation-adjusted converson of 1000 Mark into 2024:
1916: 3828€ / 4114$ / 3269£
1922-36: 5529€ / 5943$ / 4722£
1937-38: 5954€ / 6399$ / 5084£
https://fredriks.de/hvv/kaufkraft.php
Deutsche Bank:
https://www.bundestag.de/resource/blob/459032/1d7e8de03e170f59d7cea9bbf0f08e5c/wd-4-096-16-pdf-data.pdf
https://www.bundesbank.de/resource/blob/615162/5a6229cebc0134fb82eba4055a927812/mL/kaufkraftaequivalente-historischer-betraege-in-deutschen-waehrungen-data.pdf
