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 the United States because it meets three requirements:
it was first published outside the United States (and not published in the U.S. within 30 days),
it was first published before 1 March 1989 without copyright notice or before 1964 without copyright renewal or before the source country established copyright relations with the United States,
it was in the public domain in its home country on the URAA date (January 1, 1996 for most countries).
For background information, see the explanations on Non-U.S. copyrights. Note: This tag should not be used for sound recordings.
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