The Spock action figure my father gave me as an infant, once given to him by his father in the 70s.
When I was 8 I saw TPM and WOK and later started seeing reruns of TNG on a specific channel. 2 episodes per day, starting 15 pm. The episodes I remember most distinctly having seen during that period are Future Imperfect, Allegiance, Tapestry, Frame of Mind and Parallels. My other memories, although containing many details, tend to be much more agglomerated.
I also saw some VOY episodes on the evening which aired once a week, but it never galvanized me as a kid in the same style as TNG did. I'm pretty certain that it was either S4 or S5 episodes.
EDIT: When I first saw TOS as a 16 year old, I had a strange feeling of having seen some of it before, but unfortunately I've been unable to ascertain or concretize anything. From the beginning, I've had a strong intuitive feeling that it happened even before I saw Star Wars, which occured into my 4th year.
Almost felt like when I saw Lucio Fulci's House by the Cemetery as a 14 year old. I had the strongest sense of familiarity to almost everything in that film.
Some years later, already having become the big Fulci aficionado who not only disrelishes anti-intellectual critics who subsume his film as exploitation but even most of his own "fans" who tragically enough simply venerates him as the "Godfather of Gore", I discovered that this was the movie that was on the same tape as Bugs Bunny and Popeye. Right after the credits for Popeye, House by the Cemetery commenced. That movie mystified me for years, and if I hadn't found that tape, I would have spent my life trying to find out which film that was and I would never have known why The House by the Cemetery seemed so familiar every time I watched it.