The "Metal Master" lathe was manufactured by the Metal Master Tool Company of Mt. Ephraim, N.J. 08039 USA and appeared for the first time in advertisements in the October 1965 editions of Popular Mechanics and Popular Science magazines and in the November issue of Mechanix Illustrated. The lathe continued to be advertised infrequently for the next twelve months or so - and then disappeared. Although its name was similar to the "Metalmaster", a lathe produced in very limited numbers in England, the two machines had nothing in common.
The Metal Master was in direct competition with the well-established and very popular Austrian-built Emco Unimat SL and yet, whilst both lathes shared exactly the same basic design - a flimsy, twin-bar bed, aluminium headstock and tailstock castings, a central leadscrew, overhung spindle drive,  and a very basic tool slide  - somehow the SL contrived to look "right" whilst the American machine looked completely "wrong"; this was a lathe unlikely to be capable of serious work - though still better than not having one at all.
Although the advertisement mentions Accessories never before available it is certain that, whilst its standard equipment was as sparse at that provided with the SL (except that there was no motor), a steady rest, a few tool bits and a small vice were the only extras to reach the manufacturing stage. The company also offered a small drill press.
If any reader can provide copies of Metal Master advertising material, the author would be pleased to hear from you.