It's not the first time he does this. He also did it before being president.
Hard not to think he was in on it, since he tweeted his support at the dame time the coin was being launched. Also, he met past October with the people responsible of this coin. Many of his own followers fell for this scam.
50s was a good time for politics, until we fell for a militar coup in 55, where civilians were bombarded by our own airforce.