(Book). The Official Vintage Guitar Magazine Price Guide is the world's leading reference on the values of vintage and collectible instruments. Compiled using critical research and analysis, it appraises electric and acoustic guitars, amps, basses, effects, mandolins, steels and lap steels, ukuleles, and even banjos With information on more than 2,000 brands along with 1,300 photos and more than 192,000 copies sold, The Guide remains the industry's hands-down leading source of pricing information.