Harrison M450 Lathe - late version badged "450" and with headstock control levers as flat bars with rounded ends and an apron where the centre section is stepped.

Harrison 17-inch Model M450 Lathe - early version, sometimes with "17-inch" badges, white or silver facing plates on the headstock and screwcutting gearbox and the screwcutting gearbox control levers tipped with black knobs: Instruction Manual, Maintenance Manual and Parts Manual as useful Exploded Assembly Diagrams with 10 electrical schematics covering the various versions.

DoAll Lathe marked "16 ½” . This is actually a Harrison M450/500 Operation and Maintenance Manual with Parts as Exploded component Drawings.