A boxed Parker-Hale No. 9G aperture backsight assembly for the Long Lee-Enfield service rifle, complete with micrometer elevation and windage adjustment. This precision sight was commonly used in competitive and service-style shooting and reflects the peak of British interwar and early 20th-century sight engineering. Clearly marked “Parker-Hale Model D.9A,” and bearing the “P-H” triangle logo, it retains its original finish and is accompanied by its factory-labelled cardboard box. The sight includes patent references and is designed for accurate long-range marksmanship. The box reads:“B.S.A. Pattern Service Rifle Aperture Backsight – For Long Lee Enfield Rifle – List No. 9½ S – PRO. PATENT 780825.”