What medium is "Roundel with Angel Supporting a Heraldic Shield"?

Roundel with Angel Supporting a Heraldic Shield is Colorless glass, silver stain, vitreous paint.

Is "Roundel with Angel Supporting a Heraldic Shield" in the public domain?

Yes, Roundel with Angel Supporting a Heraldic Shield is in the public domain and available for free download under CC0 license.

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This artwork was created ca. 1530.

Unknown Artist, ca. 1530