What are the key differences between various hockey card brands and sets, such as Upper Deck, Topps, and O-Pee-Chee, and how do these differences impact their popularity and value?

What are the key differences between various hockey card brands and sets, such as Upper Deck, Topps, and O-Pee-Chee, and how do these differences impact their popularity and value?
Admin 4 days, 6 hours ago in Hockey Cards
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