When was "Head of a Man Wearing a Cap or Helmet" created?

This artwork was created possibly 2nd–3rd century.

What medium is "Head of a Man Wearing a Cap or Helmet"?

Head of a Man Wearing a Cap or Helmet is Fossiliferous limestone.

Yes, Head of a Man Wearing a Cap or Helmet is in the public domain and available for free download under CC0 license.

Unknown Artist

possibly 2nd–3rd century

Medium

Fossiliferous limestone

Dimensions

H. 9 in. (24.1 cm)

Classification

Sculpture-Stone

Culture

Celtic

Department

Medieval Art

Museum

Metropolitan Museum of Art, New York, NY

Credit

Gift of Torkom Demirjian, in honor of Mary and Michael Jaharis, 2000

Accession Number

2000.525.1