I have an old Gem myself and can find anything on it online. The guitar seems way older than just the 80s. I love the way that the back of the neck still has a strip of bark from the tree they made it from. Also the ivory keys are Kool as well.
Unfortunately my. Daughter went into the room one day and pulled it from the wall and it kind of shattered a part of it. That's one of the reasons why I thought it might be older was because of how brittle the wood is.
I was wondering if they hold any value too them. If it's worth repairing or not