This is a faithful photographic reproduction of an original two-dimensional work of art. The original image comprising the work of art itself is in the public domain for the following reason:
This work is in the public domain in the United States, and those countries with a copyright term of life of the author plus 100 years or less.
Under United States copyright law, originality of expression is necessary for copyright protection, and a mere photograph of an out-of-copyright work may not be protected under U.S.copyright law. This photograph was taken in the U.S. or in another country where a similar rule applies (for a list of allowable countries, see Commons:When to use the PD-Art tag#Country-specific rules). This photographic reproduction is therefore also in the public domain.