Fantasy Trading Card Company produced a set of thirty Star Trek II: The Wrath of Khan large-format (5"x7") trading cards in 1982. I bought five of the cards at a card store in Ottawa (either Capital City Card or Arthur's Place) on 3 September 1983.
I've always found the oversized cards quite striking.
For a while I kept some of the cards in picture frames. Here are a couple displayed on the bookcase in my room during my annual "showcase" event circa 1984.
The card backs weren't too interesting, however -- each card had the same title graphic as above.
Lastly, the front and back of the two plastic sleeves which came along with the cards.