J-45 Red Spruce Sunsetburst If there is one guitar that defines the legacy of Gibson acoustics, it is the J-45—one of the most beloved and played acoustic guitars in history. Since its introduction in 1942, the Gibson J-45 has become the icon of Gibson’s round-should dreadnought acoustic line. This incarnation of the J-45 features a red spruce top with scalloped spruce top braces, mahogany back and sides for enhanced tonal performance and a beautiful custom sunset burst. While this is a brand new guitar, this does bear some very light buffing scratches on the backside. Otherwise this guitar is as clean as can be!