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HankronIt's a 'stadium pin.' In various forms, hese have been sold at stadiums for many years. The most common kinds are those 1940s-60s disc pinbacks with pictures of players like Mantle and Maris. A small minority of these have a very similar ribbon, chain and charms like yours. Most have no ribbon, etc.
I have not seen yours before (which doesn't in and of itself prove anything, as I don't collect pins), though it's fair to assume that it's rare or scarce. The significance of it being purchased at the World Series is obvious.