About 17 Gauge. 28" barrels with matted rib. NSN. blued finish, checkered pistol-gripped stock and forend, hard rubber buttplate. Double barrel metallic cartridge shotgun with exposed hammers, double triggers and extractors. Locks marked JOHN BUCKINGHAM/ENGLAND and lightly engraved with simple game scenes. Barrels marked "16" and "17" with Birmingham proofs. Chambers are 2.5" for the right barrel and just shy of 2.75" for the left. Length of pull is nominally 13.75". No John Buckingham is listed in Stockel or Bailey, so it is likely this was a trade or retailer name, rather than a gun maker's name.