File:Willingham Fen mace.png

Summary
Taken from: A. Alföldi, The Bronze Mace from Willingham Fen, Cambridgeshire, The Journal of Roman Studies (1949), plate 1.

original caption: "Willingham Fen, Cambridgeshire: Club from a Celtic rustic shrine now in the Museum of Archaeology and Anthropology, Cambridge"

photograph predates 1949.

Rationale for fair use in Hercules' Club (amulet)
This picture is being used in Wikipedia's article Hercules' Club (amulet)

Academic fair use is claimed, Further, the use of the image is fair because it is not being used merely to decorate the related article, but rather:
 * It is a low resolution image;
 * It does not limit the copyright owner's rights to the original academic publication in any way
 * Represents a notable object related to the article topic.

It is unclear whether the image falls under US copyright. The above rationale applies only provided it is indeed protected by copyright. The photograph may also be a reproduction of an earlier publication, in which case the image is in the public domain also in the US.