My first is XK 1080: November '84 4001 FG.
My last is XK 1212: November '84 4003s MG (with ROS).
My question is this: In 1984 RIC was making 4001's and 4003's. What would be the difference in these models? (I know the "S" pictured is different with no binding, a dot board, and mono). But what differences would the regular 4001's and 4003's have in this time period?
