Who created "Cup (gobelet litron)"?

Cup (gobelet litron) was created by Sèvres Manufactory|Michel-Gabriel Commelin|Jean Chauvaux in 1782.

What medium is "Cup (gobelet litron)"?

Cup (gobelet litron) is Soft-paste porcelain.

Yes, Cup (gobelet litron) is in the public domain and available for free download under CC0 license.

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Sèvres Manufactory|Michel-Gabriel Commelin|Jean Chauvaux, 1782