Just visible on the headstock of this circa 1950/51 100 series (Mk. 3a) Clausing lathe is an Atlas badge. The use of this badge by the new owners of the Clausing company has managed to cause a good deal of subsequent confusion …….
The 100 Series lathes built in the 1950s were fitted with the much-improved "instant-release" apron which began life on the all-new 200 series lathe in 1949 - it obviously being more economical to produce one design of "Automatic" apron than two.
To fit with the Catalog numbering system of their other products, when Atlas took over they renamed the 100 lathe as the 4800 - and the 200 as the 6300.