License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
James Purdey the Elder. Pair of Four-Barreled Turnover Percussion Pistols of Henry Pelham Fiennes Pelham-Clinton, 4th Duke of Newcastle-under-Lyne (1785–1851), with Pair of Box-Lock Turn-Off Pocket Pistols, Case, and Accessories, 1831. The Metropolitan Museum of Art.