The influence of pre-war Martins and Gibsons shows up here in the 0/00-sized guitar that John calls his “K-body.”

• top: Carpathian spruce

• b&s: rosewood

• frets to the body: 13

• binding: curly maple

• graphite truss rod

• bracing: scalloped

• bridgeplate: very small, à la early-20th-century Martins and Gibsons