When was "Roundel with Christ as Savior of the World" created?

This artwork was created 1520–30.

What medium is "Roundel with Christ as Savior of the World"?

Roundel with Christ as Savior of the World is Colorless glass, vitreous paint and silver stain.

Yes, Roundel with Christ as Savior of the World is in the public domain and available for free download under CC0 license.

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Unknown Artist, 1520–30