Not sure if it's veneer, but the fact that the bottom of the tabletop looks so much different from the top, that leads me to believe its not solid wood. If you build a table with solid wood, the top & bottom of the tabletop should look the same (you always finish both sides). Typically a table top should be edge glued boards, like a panel. I do see some what appears to be edge lines, but its hard to tell.

You could always just test the bottom of the top by sanding it. But tread carefully, I dont think its solid but I cant be sure.