Needing some help figuring out my Panasonic sl-1000 Turntable

That's right a Panasonic sl-1000. Not National Panasonic or Technics by Panasonic but just Panasonic. I recently bought at a garage sale and I really didn't realize what I have bought. I bought it from the original owners, who originally bought it at oversea in 1969. I have done some research on my own but I really can't pin point the exact origin on why this turntable is different from other 1969 sl-1000. Most of them, that I have found all have National Panasonic, unlike what it is said on mine. Just Panasonic. I do know, my turntable is considered universal do to the adjustable voltage. My serial Number is 600128. Some one told me that my turntable was made in Dec of 1968 but wasn't sure if it was the 6th one made for that month or for the whole production. It also came with three original owners manual. They all have the National Panasonic on them. Everyone has told me that the tonearm that came with the turntable was kind of uncommon. IT'S THE EPA-99. The three manuals I have are for SL-1000, EPA -99 and SP-10. I've also been told, since it just says Panasonic. That my turntable is extremely and belongs in some kind of Vintage stereo museum. I'm a complete noob to the whole turntable world. I originally bought to play in my garage, while I was working on my car but after finding out  a few things. I'm kind of almost hesitant to use it, since it's so valuable. I guess I'm wondering, is it that valuable as there making it out to be. A lot of people are telling me, it's a find of a century. Especially, I only paid 30 dollars for it. Roughly, what is the value for something like this. I've been told it's worth easy 1000 to the sky is the limit do to the name plate calling it a Panasonic.  Any help would be greatly appreciated.  Thanks