Colchester Triumph (and "Dominion") 7.5-inch centre height (Model 15-inch) lathes - early models with "rounded" headstock Mk.1, "Mk.1.5 with safety apron) and the Mk.2 (also sold, in the USA, where it was called the "15-inch" and often with the Clausing brand name with the Model numbers: 6535, 6576, 6577, 6536 and 6537). A complete 175-page data pack covering all models from the late 1930s on either separate cast-iron plinths or on the later (early 1950s) full cabinet stand. Instruction and Maintenance Manual and with Exploded Component Parts Pictures. The literature includes a copy of the first Triumph Operation and Parts Manual (originally in A5 format) and the later A4 edition covering all models from first to last including the later single-slot (safety) apron types and all gearbox variants - Standard, Dominion and Continental - as well as the rarer 3rd-shaft control and Hydraulic-copying models. Includes full screwcutting charts, electrical schematics and several copies of the maker's Sales and Specification catalogues dated 1930s to 1960s.