I remember contacting Roger Giffin about this Junior sibling to my short scale Explorer and he went out of his way not to state that it was made while he was still associated with Gibson as their "West Coast Custom Shop". Basically all he said was that it looked like something he might have done. It is 100% his (then) trademark look and really a deadringer to my Explorer (which wasn't made during the Custom Shop era either, but I knew that when I bought it, it is my "fake Rembrandt" in the collection).
Geddy Lee playing that thing is a preposterous thought though, have fun trying to get his grindy trademark clank sound out of it, short scale and neck pup equipped as it is.
If the Rush connection is true then - also by the looks of it, he likes fancy, translucent or natural tops, Geddy not so much - it is more something Alex Lifeson might have used for demoing his material ("See, Geddy, not all basses have to go clank, just listen here!").