This acoustic pickguard section shows designs specific to Gibson®. J-100 Guitars. based on the original models GIBSON J-100/J-100 CUSTOM (1939-1975 MODELS) The GIBSON J-100 XTRA was introduced around 1991 and was based on the late 1930s Gibson SJ-100 model. The first ones had mahogany back, sides and neck, but you also see maple (1999 to 2005) or bubinga (2005 onwards) back and sides. ou can of cause fit any of the manufactures shapes to different instruments meaning that you can change the look of your instrument by choosing a design from another manufacturer. Enjoy browsing through the many designs possible and have fun picking your favorite or have us create something truly unique through our custom shop.