Production
Matsumoku 
1984 to 1987
St. Louis Music (SLM) Korea 
1989 to 1990
Model Names & Numbers
Spectrum I | X120 |
Spectrum IA |
WE2400 |
Spectrum II | XA1220 |
Spectrum III |
XA1330 |
Spectrum Basic | X120 |
Spectrum DX |
X140 |
Spectrum FX |
X199 |
Spectrum GT | X185 |
Spectrum LX | X198 |
Spectrum MX |
X139 |
Spectrum S |
S Series |
Spectrum Special |
X120 |
Spectrum ST |
X135 |
Spectrum SX |
X188 |
Spectrum Series II | SP1012ST |