Based on those 2 pictures I would say veneer. That being said sometimes it's difficult to tell even when the pickup cavities are right in front of your face depending on how strong the figuring is in the flamed maple.
Tokai's veneers are very thin, l think they had a press or something to get them that thin. It can be very hard to tell. My eyes aren't good enough to see with those pics 100 % but some LS120 from that period are solid flame tops. I have one from '81. They are out there.
Much less than 50:50
LS-120's are almost always veneer.
I've only seen pics of one LS-120 that was clearly solid flame top, don't remember what year it was.
Can be very hard to tell sometimes if a top is veneer. Can't tell from those pics.
Edit - actually the seam line looks off from the top going into the cavity. Need high res pics of that. I don't see anything in the pics to make me think its a solid top.
Hard to say with those pictures. How about a picture of the guitar and flame pattern? The veneer examples are very symmetrical across the guitar since it is two thin pieces sliced right next to each other and solid tops usually have some variation as you move further away from the center line.
I'm with @JDZ, it's highly unusual to find an LS-120 from 1980 with a solid top. Every example I've seen from that year has been a veneer. I'm not suggesting they don 't exist, but my assumption would be veneer without some very clear evidence indicating otherwise. And I don't see enough evidence in these pictures.
I had an LS-120 with a fairly mundane flame top that I thought might be solid. And the seams matched very very closely. However, with a pretty strong magnifying glass, I was able to detect a slight mismatch between the top seam and seam in the cavity, so it was definitely a veneer, and a thin one at that.
I think the top and center line match. What we see as the centerline is not the centerline. Follow the grain and it matches up. I see a line but I don't think it's the joint, the grain extends beyond it.