This is an AXL Stratocaster-style electric guitar, in purple sparkle finish, a double cutaway body, 21 fret fingerboard with dot inlays, three pickups, a selector switch, three rotary controls, and metal bridge/tailblock and white pickguard.
It is signed recently on the body in silver felt pen by Mick Jagger, Ronnie Wood and Keith Richards, in gold felt pen by Charlie Watts and in red felt pen on the pickguard by Bill Wyman. It is accompanied by a document concerning the provenance.