American owned Unicord contracted Matsumoku to build most of its Univox and Westbury guitars. Louis Music Company imported Matsumoku built Electra Guitars. Matsumoku built many early Greco guitars as well as Memphis, Vantage, Westbury, Westminster, Cutler, Lyle and Fell.
Washburn Guitars contracted Matsumoku to build some of its electric guitars and basses from 1979 through 1984, however Yamaki was the manufacturer for the Washburn Wing series which share many components with Yamaki-made Daion guitars.
These issues were addressed early on with Matsumoku.
The solution was to use wood that had been dried for at least two years, stronger glues with longer clamp times, and one feature that remained throughout Matsumoku's production: the 3 piece maple neck.
By the early 1960s, Matsumoku had acquired new mills, lathes and specialized presses and began to increase musical instrument production.