What medium is "Watch with portrait of Friedrick Wilhelm, the Great Elector"?

Watch with portrait of Friedrick Wilhelm, the Great Elector is Case: painted enamel on gold; Movement: brass and steel.

Is "Watch with portrait of Friedrick Wilhelm, the Great Elector" in the public domain?

Yes, Watch with portrait of Friedrick Wilhelm, the Great Elector is in the public domain and available for free download under CC0 license.

This artwork was created case ca. 1688, movement ca. 1750.

case ca. 1688, movement ca. 1750

Medium

Case: painted enamel on gold; Movement: brass and steel

Dimensions

Diameter (case): 1 9/16 in. (4 cm); Diameter (back plate): 1 1/4 in. (3.2 cm)

Classification

Horology

Culture

Swiss, Geneva case with German, Berlin movement

Department

European Sculpture and Decorative Arts

Museum

Metropolitan Museum of Art, New York, NY

Credit

Gift of J. Pierpont Morgan, 1917

Accession Number

17.190.1522