1968
Two-tier gold market
The London Gold Pool collapses in March. The official price stays for central banks. The free price can move away from $35.

In March 1968 the London Gold Pool collapsed. The effort to hold the free-market price near $35 stopped. A two-tier market followed: an official price for central banks, and a free price that could move away from $35.
The foreign official window at the Treasury is still open. It closes on 15 August 1971. Private Americans are still barred from monetary gold.