Well, if you are not aware of it, I spend a lot of time researching and now writing about old Topps sets and the history of the company and its affiliates. I suspect I do this because I am a frustrated historian but it is something I enjoy doing, so much in fact I created a blog:
http://toppsarchives.blogspot.com/ I am also trying to put together a full type run of every card or object they ever issued in a pack or vending machine from 1948-80, a project that ebbs and flows with my disposable income and mood of my wife. I collect a lot of Topps ephemera too.
I was primarily interested in just their baseball issues for a long time but over the last couple of years have pretty much embraced anything Topps produced in the pre-Fleer/Donruss era (I leave the New Wave years to others). Right now I am grokking on their hockey sets.
What I am wondering, since it is clear hockey cards are much less of a known quantity than baseball or NFL football when it comes to how they were marketed and sold, can any of you chime in on what you believe to be the toughest Topps and OPC sets from the pre-81 period? It can be regular issue, inserts, secondary sets, whatever. Just curious as to what the top five or six toughest issues are considered to be by you guys.
Thanks!