1959 Gibson Les Paul Junior

The 1959 Gibson Les Paul Junior electric guitar.

Andy Summers often used the Les Paul Junior as a slide guitar - e.g. for the guitar solos on "Next To You" and "It's Alright For You". He has two Gibson Les Paul Juniors of different finishes - a brown (natural) one and a sunburst one - so it's unclear which of the two he used specifically.