Sheldon 10-inch L and XL (and many variants) later-type model, most on an underdrive stand but sometimes found as a bench-mounted type with a rear-mounted countershaft and the word "Sheldon" in large letters on the right-hand face of the headstock belt-drive cover. V-belt transmission a screwcutting gearbox with a single selector lever on the front face as sold from the late 1940s to early 1950s under various designations.
A comprehensive 169-page Data Pack with the operator's Instruction and Maintenance Manual, Illustrated Parts Manual as Exploded Component Drawings, an Electrical Schematic, the contemporary 48-page maker's Sales, Technical Specification & Accessories Catalog and a copy of the Sheldon Publication "Care and Operation of a Lathe". For the later twin-tumbler version see: https://store.lathes.co.uk/print/ms526bt