This is a faithful photographic reproduction of an original two-dimensional work of art. The work of art itself is in the public domain for the following reason: This digital reproduction has been released under the following licenses:

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https://creativecommons.org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue

In many jurisdictions, faithful reproductions of two-dimensional public domain works of art are not copyrightable. The Wikimedia Foundation's position is that these works are not copyrightable in the United States (see Commons:Reuse of PD-Art photographs). In these jurisdictions, this work is actually in the public domain and the requirements of the digital reproduction's license are not compulsory.