Made by Keith McPherson and son Ron, who ran HI-FI & MUSIC CENTRE at 205Dorset Rd Boronia (Melbourne, Australia) from circa 1964 to 1972. [Source including image of a 1964 prototype, and the Mark IV model that was the only model made, courtesy of Tim Robbins]
Image of M logo at left is from a McPherson speaker quadbox on eBay July 2012
Original early blue covered McPherson 60 watt head and quad box – and later black covered ( right ) 60 watt McPherson Amplifiers both with 4 x 12″ Rola UEG Speakers. On stage at The Mad Hatter in Little Lonsdale Street Melbourne mid 1966 – images courtesy of John Fox, Two By 2 Band – Melbourne. December 2015.