Tonemaster was a brand name of the Imperial Accordion Company of Chicago. Tonemaster guitars were made by Crucianelli in Italy for distribution in the USA by Imperial - sometimes labelled Tonemaster by Imperial. Identical Crucianelli guitars were distributed elsewhere under different brand names - e.g. Elite, Ardsley, Baron, Crestone, Philharmonic, Reno, Supreme & Sorrento. Imperial also used their Tonemaster brand for amplifiers made by Estey.

Source: Fetish Guitars - Tonemaster ( February 2021)