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What are the signifiers of the year embroidered on the backs Twins Enterprises Cooperstown Collection hats?

For example, one of their Hats Milwaukee Brewers in 1989 on the back. I can not think of something significant happened this year for the franchise. Is this just a sample of year when the team did that (ball glove logo design & a blue hat with yellow front)?

that's all it is .. given as a year to go

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