Definitely all-alminate but you might never know it. The 331 (1977-1981) is the predecessor to the venerable SJ-180 (1981 -1985?) and in my opinion a little nicer and little harder to come by.
The 331 has the truss rod adjustment at the headstock; the 180 inside the sound hole. The 331 also has the inlaid center stripe on the back; the 180 does not.
I've owned two SJ-180s and I liked them. i would snatch up a 331 if I could find a deal on one. good score!
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