The author of this image from Switzerland is unknown, and the image was published at least 70 years ago. It is therefore in the public domain in Switzerland by virtue of Art. 31 of the Swiss 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 Switzerland.
This image, which was originally posted to Flickr, was uploaded to Commons using Flickr upload bot on 19 January 2009, 06:12 by Väsk. On that date, it was confirmed to be tagged as no known copyright restrictions.
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