The markings indicate authentic period manufacture with S-prefix barrel numbering, B-prefix frame designation, and 280 batch number stamped on the cylinder end. Over the course of Premier production (1964-1975), engineering changes divided the guns into six distinct series, with the B Series being notable as the first utilization of a PTFE piston seal in a Webley air pistol.
Webley & Scott started designing and distributing guns in England, specializing in revolvers and becoming Britain's Police and UK Armed Forces primary supplier for over 50 years. The company adapted to produce pneumatic guns after the 1920 Firearms Act limited civilian handgun availability, with demand for air guns increasing rapidly in the 1920s.
Complete with original box, this pistol represents superb preservation of a significant British airgun manufacturer's premium model from the golden era of spring-piston air pistol development.
Ref: Vintage Air pistol Cabinet