Full Guitar Repair Shop and Amp Repair; all in house. Gerhart Guitars USA Custom Built Guitars Master Luthier Sherlin Gerhart; graduate of Roberto-Venn School of Luthiery in 2001. Sherlin and Al . Sherlin creating. Sherlin hard at work. Gerhart Guitars USA Gerhart Bluesman Lefty Bluesman Butterscotch Gerhart Coupe DeVille Gerhart Guitars in stock. Gerhart Guitars USA Custom Name Plate Wood to choose from to custom build.