This is an 17 3/4" 1950s Hopf 320SL. One of their top models made by master luthier Gustav Glassl. Bill Haley played one of these. An incredible guitar. Excellent condition with Schaller double PU. Excellent sound and action. Superb neck. Its heavy.  It's  large. It's a rock'n'roll icon. A very rare guitar. 
£1500