In 1969 Gibson introduced a series of guitars with low impedance pickups including the Les Paul Personal and Les Paul Professional models. Les Paul favoured low impedance pickups for the clarity they gave to his clean jazz tone.
In 1973 Gibson added a semi-hollow bodied guitar to their low-impedance series, called the Les Paul Signature. The model was produced until around 1979.
The Les Paul Signature looks like an ES-335 with an extended lower cut-away. Inside it is more like the ES-330: it does not have the solid central block of wood under the pickups and bridge: instead it has a block under the bridge only. A few early Signatures had the Les Paul Recording pickups installed, most came fitted with the rectangular low-impedance type. This guitar came with individual low and high impedance output jacks (on the front and side of the guitar, respectively). In 1976 high and low impedance humbuckers became an option on this model. Finish options were Gold Top (around 1400 Gold Top Les Paul Signatures were made - walnut was used for the back and sides on Gold-tops) or Tobacco Sunburst (a much rarer finish option with less than 100 made).