The 1970 Gold Duster was a mid-1970 model year introduction, so the details are not printed in the early factory literature & ads for them seem to be scarce. Here is a fender tag from a 1970 Gold Duster;
1972 saw new variety in the Duster line, with Twister and Gold Duster packages. The Twister was essentially a cartoon decal, paint, and stripe job, while the Gold Duster added decals.