For me, living in Canada, it was the 1985/86 O-Pee-Chee Mario Lemieux RC. I got my first Hockey card price guide, i believe it was called the Charlton Hockey Card checklist and price guide somewhere shortly after 86 or maybe 87. The Lemieux RC booked for something like $6 and i thought it was really cool because i owned 4 copies of it.
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