 The first attempt resulted in 10 prototypes made by Semi Mosely.Joe Hall built the next line of guitars, a run of Mosrite-inspired double-cutaway guitars and a basses that featured an aluminum casting that housed the pickups, bridge and tailpiece.In 1967 Sam Koontz and The Harptone Manufacturing Co. designed and built a product line of 10 semi-hollow body and arch-top guitars, five acoustic models in six-string and 12-string variants and two basses