Bisley 4 x 20 Air Rifle Telescopic Sight

A Bisley 4 x 20 telescopic air rifle sight, featuring a fixed 4x magnification and a 20mm objective lens. The eyepiece bears the printed marks BISLEY and 4 X 20 in a gold-tone finish. The scope is finished in black and is fitted with a pair of two-piece dovetail mounts suitable for a standard air rifle or rimfire rail. It includes elevation and windage adjustment turrets with screw-on protective caps.
Serial number: [not visible]
Firearms Act classification: Unrestricted.