W. Duke, Sons & Co.
License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
W. Duke, Sons & Co.. Luiz I, King of Portugal, from the Rulers, Flags, and Coats of Arms series (N126-2) issued by W. Duke, Sons & Co., 1888. The Metropolitan Museum of Art.