The paper discusses the history of Clara Bernthal, a postcard publishing house from Gdańsk founded in 1898. The author provided information about the founder of the publishing house and the postcards on the basis on the archival materials. The text has been supplemented by a catalogue of Clara Bernthal postcards from Biblioteka Gdańska’s holdings. Collectors, museum registrars and librarians will find this information helpful in identifying publication dates of the postcards.