This guitar was subject of a sale in Japan in July 2021 price looks to be around £1000 and £1500 it was brought to my attention by Asmikace from the Yamaha Musicians forum. It appears to be a 1985 special edition for a specific retailer I have no idea how many were made could easily be just this one.
It appears on Yahoo auctions and Ebay, these details are from the sale
Old Yamaha domestic solid model with a characteristic shape reminiscent of SWINGER.
1985 from the notation of serial and head.
It is a model outside the catalog, and the neck pocket has a notation of "branch store model", so it seems to be a shop order limited model.
Body Ash
Neck Maple
Board Ebony
Frets 22
Scale 648mm
Nut 42mm
If anyone knows anymore about this please email me.