The coin, with a face value of $20 and distinctive design of an American eagle in flight on one side and Liberty striding forward on the other, was the last gold coin struck for circulation in the United States.
The daylight robbery was the latest high-profile crime to hit Mexico City, where crime has increased during record lawlessness plaguing the country.
German police have found no trace of a 100-kg Canadian coin since an elaborate late-night heist in March 2017 from the Bode Museum.
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