"Weißgerber" and historical guitars

Richard Jacob Weißgerber Studia Instrumentorum Musikinstrumenten-Museum Markneukirchen Rainer Krause/Antique Guitars Cantomano – Antique Guitars Lorenzo Frignani Gitarren-Archiv Österreich Early Romantic Guitar Sinier de Ridder Stauffer & Co. Andreas Schlegel Brigitte Zaczek Frets.com Museum Virtual Museum of Early Martin Guitars Vintage & Rare