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My question is baseball card related. I'm thinking that at the MLB level, the switch from flannel to polyester came around in the very early 1970's.
What year do you all think the switch in uniform materials took place?
Once I have a few replies, I'll post a scan of a card that makes one scratch their head.
What year do you all think the switch in uniform materials took place?
Once I have a few replies, I'll post a scan of a card that makes one scratch their head.