We are grateful to Dott. Mario Epifani for endorsing the attribution to Sebastiano Conca upon inspection of images, and for proposing a date of execution of after 1750. Dott. Epifani notes stylistic similarities with another of Conca's late paintings on copper, a Crucifixion
in the collection of the Museo Diocesano, Gaeta, which is signed and dated 1764.1
1 Centro Storico Culturale, Sebastiano Conca (1680-1764), exh. cat., Gaeta 1981, p. 356, cat. no. 134a, reproduced p. 357.