The Ibanez S300 (S300SV) acoustic guitar was made in the mid-late 1970s to around 1980. It was a budget dreadnought shaped steel string acoustic with the following features:

• Laminated spruce top, Ibanez S300 tops were laminated from three layers of select spruce. Other more expensive Ibanez models were available with solid spruce tops though. The back and sides were mahogany.
• Scalloped bracing. The technique of arching the interior braces or "scalloping" provided strength combined with freedom of vibration. Ibanez claimed their scalloped brace dreadnoughts had a full and rich sound with excellent projection (presumably in comparison to their non-scalloped brace models).
• Tru-Tune saddle. In order to assure good intonation the S300 featured the Tru-Tune compensating saddle. This staggered length saddle allows for the differences in strng tension keeping the instrument in tune all the way up the neck
• Arched backs. This was a revolutionary concept at the time, but Ibanez used the arched back on some dreadnoughts to provide strength, eliminating the need for braces. They used computer models to calculate the forces involved and to design the arch for enhanced projection and bass.
• Satin violin colour. The S300 in satin violin finish was designated the S300SV model. This finish was created by gently wire brushing the top, adding a texture that followed the grain of the wood. The very soft wood is removed by the brushing and reduces the overall weight of the top (without sacrificing strength - according to Ibanez). Ibanez claimed this resulted in increased power and volume. The violin stain added contrast and highlight to the top and the instrument was finally sealed with a satin finished.
• The S300SV headstock used Ibanez's mid-late 1970s shape - slightly splayed out (Guild style), with six-a-side tuners and the Ibanez logo painted on in white at the top. The larger, more massive head was designed to improve the sustain of the instrument.
• The fingerboard had diamond cross inlays and 18 frets.