A Back-Action Sidelock Ejector Double Rifle chambered for the .500/.465 Nitro Expresss cartridge circa 1920. It has 26” ejector rifled barrels with concealed third fastener (treble grip), Quarter rib with express rear sights - 1 standing (100 Yds) and 2 folding (200 & 300 Yds). Island base foresight with fold up night (moon) sight A fine example from this renowned London Best gun and rifle maker.