The Guild Slim Jim T-100D was described as follows in the 1968 Guild catalog
The jazz guitarist's favorite in this price range! Light in weight and easy to handle... an electric guitar built for the player who prefers the advantages of a slim instrument with a noteworthy range of performance. Extra-thin ivoroid-bound body is 16 3/8" wide, 20 1/4" long, 2" deep. This instrument spells "showmanship" in every feature. Has a slender, fast-action Honduras mahogany neck, reinforced by Guild's adjustable steel neck rod. Rosewood fingerboard is inlaid with pearl position markers. Equipped with 2 built-in Guild "Frequency Tested" pick-ups, with 2 tone controls and 2 volume controls, toggle switch for pick-up selection, and individual string adjustment screws. Has the Guild deluxe tailpiece... and, for a final touch of quality, a set of factory-fitted Guild EA-610 Strings.