The Guild M-75 or Bluesbird, as it was known, initially featured a chambered body design, but by the time of this advertisement in 1975, it had a fully solid mahogany body. It had also been upgraded with a master volume control and phase switch, making a very playable, and now highly saught electric guitar. The mid 1970s Bluesbird came with chrome (M-75CS) or gold (M-75GS hardware), Guild HB-1 humbucker pickups and the Muller adjustable bridge.
It was clearly aimed at the Gibson Les Paul market, with it's comparable controls, construction style and materials.. "before you buy a similar looking guitar try the Guild M-75. Guild costs you a lot less, yet gives you features the other doesn't have including a phase switch and master volume"
Features the Guild Quantum amplifier M85 bass guitar, M75 electric guitar and electric organ with rotoverb
The Total Amplifier - for Bass, Organ and Guitar. 200 watts of clean undistorted po...
This advert from December 1971 doesn't say much; letting the guitars do the talking. From Top to bottom: M75, S-50, S-90, S-100, JS bass II and JS-bass II fretless