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The description on its file description page there is shown below.
Summary
DescriptionWalt Disney envelope ca. 1921.jpg
English: Return address of a business envelope featuring a self portrait, used by Walt Disney in approximately 1921, on display at the Walt Disney Family Museum in San Francisco.
This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain for the following reason:
Public domainPublic domainfalsefalse
The author died in 1966, so 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 50 years or fewer.
The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain". This photographic reproduction is therefore also considered to be in the public domain in the United States. In other jurisdictions, re-use of this content may be restricted; see Reuse of PD-Art photographs for details.