Looks like Terada.... Based on the wire route cut, and tenon (shape, rounded tenon corners), and glue. I would go with what Wulf thinks though.
Here is my Terada Greco ('89) neck cavity for comparison.
They help. I use Dexoit. Fixed my scratchy pot and pickup switch.
StewMac also sells a "kit" that has makes it easier to apply...
You can also find a Japanese catalog for your year EG800 that may tell you what the fret size is.
You can use the Google Translate "Live Camera" Translation to try and decipher what was used or is the equivalent that is sold here.
I can see how people get that impression from watching his videos, but if you watch enough you see he just likes to pick on people a bit in a "give them a hard time" type of way. He always admits when he doesn't know something and if you listen to the banter he is humble.
I have heard this...
Before this thread goes south, somewhere in this guitar's history they changed the logo.
Does not make it right, but that is just how it happened.
Please just appreciate nice playing with a nicely refinished (sans logo) EGF1200 from 1980.
Maybe we should help him out and ask him to change it...