The Sigma brand was established by C.F. Martin &
Company in 1970, as a way to introduce Martin models to the more
budget-minded beginning player. Although Martin continues to
offer quality instruments at bargain prices under the Sigma name,
the desire to offer a Martin model to every player, regardless of
budget, at every price level, led to the creation of the Sigma-Martin
brand (1981) and the Shenandoah brand (1983).
This is an acoustic-electric guitar, made in Korea to the specifications
of C.F. Martin & Company. The
finish is clear lacquer over red stain on a solid mahogany top, with solid
mahogany back and sides. A bound rosewood fretboard caps the one-piece
mahogany neck. Abalone inlays adorn the rosette and peghead. This model
also features an unusual curved back.