What medium is "The Slave of Fashion (published in "Harper's Bazar," April 20, 1878)"?

The Slave of Fashion (published in "Harper's Bazar," April 20, 1878) is Relief print and electrotype.

Is "The Slave of Fashion (published in "Harper's Bazar," April 20, 1878)" in the public domain?

Yes, The Slave of Fashion (published in "Harper's Bazar," April 20, 1878) is in the public domain and available for free download under CC0 license.

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This artwork was created originally published 1878.

Thomas Nast, originally published 1878