chicago dollar?

[iwannafindsome]

hi all,a friend of mine has this coin and we cant find any info on it,if anyone has or knows anything about it please let me know.
front side says chicago dollar e.pluribus unim 1878
back side says city of the lake and prairies chicago.illinois 1980 white mint

 

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[Samuelben]

odd maybe a special memeorial coin or a souevenor