1975 Guild electric guitar and bass catalog page 9 features the single cutaway Guild M-75 CS and M-75 GS (CS = chrome plated hardware, GS = gold plated hardware), and the new-for-'75 doublecut Guild M-80 CS, described as follows:
Dynamite because it's so efficient. Everything you like about a double cutaway solid body, plus everything you want in a personal kind of arched top guitar. M-80CS is more than a rock guitar; it's a different way to get deeper into the style of rock that's yours. To help you do it: Full 24/4" scale. Guild Humbuckers. Polarity-reversing phase switch. Master volume. Lots more. Spend a little time with this one You'll find yourself a new friend.
US list prices for these guitars (June 1975), were as follows, M-75CS, M80CS: $495; M-75GS $550.
$1250
$2999
$5499
$5995
$6095
£5500
£1485