What medium is "Souvenir with portrait of a man, said to be Lieutenant d'Alézac"?

Souvenir with portrait of a man, said to be Lieutenant d'Alézac is Gold, tortoiseshell.

Is "Souvenir with portrait of a man, said to be Lieutenant d'Alézac" in the public domain?

Yes, Souvenir with portrait of a man, said to be Lieutenant d'Alézac is in the public domain and available for free download under CC0 license.

This artwork was created 1780–81.

1780–81

Medium

Gold, tortoiseshell

Dimensions

2 3/8 × 2 in. (6 × 5.1 cm); miniature, oval: 1 1/2 × 1 1/8 in. (3.8 × 2.9 cm)

Classification

Metalwork-Gold and Platinum|Miniatures

Culture

French, Paris

Department

European Sculpture and Decorative Arts

Museum

Metropolitan Museum of Art, New York, NY

Credit

Gift of J. Pierpont Morgan, 1917

Accession Number

17.190.1318a–c

Rights

Public Domain