Hi guys,
If I am to assume the electronics are original, I would be shooting for an LS-60, somewhere between 1981 and 1984.
The 2 piece solid plain top was used on LS-60 Love Rocks of this era, later Years had a flame veneer. LS-50s tended to have 3 piece tops.
Double cream, 12 screw Gotoh pickups were also used on this Model at this time. Later models would revert to 6 screw.
The absense of a stamp in the front pickup cavity also places it after 1980.
In regards to the serial number, it is quite likely that in the refinishing of the headstock after the repair, the original S# was lost and a dummy one applied. More is the pity that the original wasn't recorded and reproduced - even crudely - rather than the poor attempt of a 60's Gibson S#.
The serial number aside, this sounds like a great guitar, seems to have been built in the right "era" for Tokai Love Rocks so play and enjoy it.
regards
Peter Mac