When was "Triple-back settee (part of a set)" created?

This artwork was created ca. 1790–1800.

What medium is "Triple-back settee (part of a set)"?

Triple-back settee (part of a set) is Carved, gilded and painted walnut, reverse painted glass, cut and voided 17th-century crimson velvet.

Yes, Triple-back settee (part of a set) is in the public domain and available for free download under CC0 license.

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Unknown Artist, ca. 1790–1800