The author of this image from Liechtenstein is unknown, and the image was published at least 70 years ago. It is therefore in the public domain in Liechtenstein by virtue of Art. 34 of the Liechtenstein Copyright Act..
Note that this applies only if a reliable source is cited to indicate that the author is not publicly known; just not knowing who the author is is not enough to qualify the image as public domain. This image may not be in the public domain in countries other than Liechtenstein.
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.
Uploaded a work by LI LA (Historisches Lexikon Liechtenstein) from Historisches Lexikon Liechtenstein https://historisches-lexikon.li/Imhof,_Leopold_Freiherr_von with UploadWizard