That looks like something out of the Pearl USA 1978 catalog, judging from the tom mounts, bass drum spurs, and the lugs. Pearl drums at that time were either 9-ply wood shells (not sure what wood), or fiberglass shells, or fiberglass-lined 9 ply wood shells. If yours are Thunder Kings with wood shells, that would make them the top of the mid-level range, something like a Vision VMX today.
Is the set yours? Is that the actual picture? Its looks to be in very good shape. If you have any plans of selling it, I suggest you keep it and enjoy it instead. It doesn't have that much of a pedigree as other more storied drums from that time, so I doubt you could sell it at a high price. But it is a really nice set. I have an early 70's Thunder King (check out my posts elsewhere), and I absolutely still love it. It is loud and raunchy. The bass drum is not that great, but the toms sound nice, and the snare is a blast. I'm not sure how well it would do in recordings, but it is great for live playing. I don't plan on selling my Thunder Kings ever, because they are just too much fun. If you do plan to sell yours, give me a call first