Colchester Student, Master and Dominion Lathes Mk 1 and "Mk. 1½" (and other versions, etc). Round-headstock model but with either a "sliding-lever" on the apron that lifts into either one of two slots to engage the power feeds - or with a single, centrally-mounted round control lever. The differences between Mk.
This page displays all the content on the website associated with the 'Clausing 6524' model. Numeric models include all prefixes, such as 'Number', 'Mark', 'Size' etc.