I’m no chemist, and no expert, but here’s my guess. Celluloid pins have the plastic coating over the paper photo on the front to protect it. Lithograph pins are painted on the front which protects them until they are scratched. Just the first thing that came to my mind.
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Baseball's appeal isn't complicated or confusing. It's about the beauty of the game; it's about heroes and family and friends; it's about being part of something larger than yourself, about tradition---receiving it and passing it; and it's about holding on to a bit of your childhood.
Tom Stanton from The Road to Cooperstown
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