The GM20 is an Mastercraft series classical acoustic guitar model intoduced by Ibanez for 1985. It was handmade in Japan.
The GM20 features a classical body shape with a solid spruce top on select seasoned rosewood back and sides. The soundhole is round and trimmed with an intricate inlaid wood rosette. It has a mahogany neck, a 19-fret ebonized rosewood fingerboard with a rosewood headstock. Components include a none compensated bone saddle in a polished mahogany bridge with wood marquetry, a bone nut, and gold plated tuning machine with pearloid buttons.
The GM10 and GM15 are similar models with different soundhole rosette marquetry.