Overrun by Zenith modules!!!

[Adam]

Is there a simple way of telling the later model stuff from the late-70s through mid-80s System 3 boards, because if I have any of these modules from the bad-CRT years, and I think I might have several modules from these years and newer, because I looked at all of them and don't recognize some of these boards at all, I'd like to clear some space by selling or just tossing them rather than putting them back in the closet. But then I don't want to do that unless I'm absolutely sure I'm not tossing something good. I'm not really concerned with looking up stuff I can clearly recognize as chroma II or early sys III. But I'll see if I can dig up one of those Zenith pamplets anyway, because it would just be useful to have.