Armstrong writes in the piece you cite:

"As far as gold is concerned, I have recommended old common date coins rather than bars and bullion."

A good fraction of my gold stash is in common date US gold coins.  Collectible historical coins..., most of mine are dated before 1900.

Looks like neither Armstrong nor even iamnotback advised us of BTC's 15% drop last night...

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CoinCube quoted from George Gilder's book Knowledge and Power.  I read that about a year ago.

Highly recommended!