It's all a matter of personal preferecne. Personally, I attempted to collect one signature of every player for every team in MLB history. They were all of equal importance to me. I nearly reached the 2/3 plateau (somewhere around 10,000 different players).
As to key teams, some folks want to acquire a signature of every player to don a uniform that season, others prefer to stick to the regular lineup, while others just want the men who saw post-season/World Series action. There are no set rules, other than the ones which you as a collector impose on yourself.
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