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).