Probably so that it could concentrate its efforts more lucratively elsewhere as the post-WW2 economy in Californian machine shops started to revive, on August 4, 1949 Small Machines Incorporated was sold/spun off as going business to MasterSon Engineering Co. of 1416 Westwood Boulevard, Los Angeles. In 1953/54 (just three years before their demise) they introduced a line of three new lathes that used the model description "Master". The cheapest in the range was the  Master "Model S" - for "Standard" - with simple bronze spindle bearings; a higher-speed version was also offered, the Master "Model BS" -  for "Ball Bearing Standard" - with a ball-race headstock whilst the top-of the range version was the Master "Model BWW" - for "Ball Bearing Webster-Whitcombe" (Webster Whitcombe being the standard for heavier types of watchmaker's lathe). The BWW had a large-bore spindle with the nose formed to accept standard  8 mm WW type collets; as there was no thread to carry chucks or faceplates these were offered mounted, in the usual way, on collets, the faceplate being equipped with eight drilled and tapped holes instead of slots. Although the models "S" and "BS" were fitted with a set of fixed-ratio fibre changewheels (though the last in the train was brass) to provide a power feed to the carriage the "BWW" was also offered with changewheels for screwcutting - though this is a very rare machine indeed. Also listed amongst the accessories (it shared much the same range as the DuoLathe) was a thread-dial indicator, a micrometer-dial equipped tailstock to take WW collets, a push-type WW collet tailstock with stop collar, a tip-up tool rest, 3-jaw self-centering chuck, a 4-jaw chuck (both chucks had hardened jaws), a tailstock drill chuck and centre drill, drill V-pad, a drill chuck adapter for the headstock, a small standard tap and die set by Morris with four taps and four dies (sizes 00-90, 0-80, 1-72, 2-56), one tap and die holder, four bushings and one set-screw wrench. Astonishingly, in 2003 the Morris Company was still in business and selling the same set. Other items included a built-in countershaft unit to give a wider range of spindle speeds, individual WW collets from 0.004" to 0.315" (or sized fractionally from 1/64th to 5/16") and a box to hold 40 collets.
Unfortunately the Master range did not have the backgear arrangement of the DuoLathe and MonoLathe, nor as part of the regular equipment the variable-speed motor, but it did retain the graduated cross-feed screw micrometer collar and greatly-improved design of tailstock. Instead of the cross-slide gib strip being a non-adjustable "corrugated" strip of spring steel, the Master range was equipped with two pusher screws fitted through the right-hand face of the slide. By this time the accessory case had become metal (neatly made and carrying a small company badge), while also available (and shown at the bottom of the page) was a neat, leatherette covered carry-case with reinforced corners designed to house the lathe and its accessory kit in the base with a top cover held down by toggle clamps.
Fitted as standard with a 110V induction motor (with switch with a 6-foot cord and plug) an alterative was offered (at $35 extra) in the form of a "universal motor" with foot rheostat control able to be used on 105-120 volts AC or direct current that gave a range of infinitely variable speeds from 300 to 3000 r.p.m.
With so few years in production sales of the Master must have been limited - the last known dated information originating from the Company was marked by the printers '1957' , three years after the introduction of a small lathe was to dominate its market sector for many years - the Emco "Unimat"
If any reader has an example of a Master BWW in their ownership, the writer would be interested to hear from you..