1934 made contractual gold clauses unenforceable. It also allowed the President to change the gold content of the US dollar by proclamation. Immediately following its passage, Roosevelt changed the gold content of the dollar from $20.67 to $35 per ounce, thereby devaluing US federal reserve notes, which were backed on gold. That valuation remained in effect until August 15, 1971, when President Richard Nixon announced that the US would no longer value the US dollar with a fixed amount of gold, thus abandoning the gold standard for foreign exchange (see Nixon Shock). The private ownership of gold certificates was legalized in 1964, and they can be openly owned by collectors but are not redeemable in gold. Following lobbying by Jim Blanchard, the limitation on gold ownership in the US was repealed after President Gerald Ford signed a bill to "permit United States citizens to purchase, hold, sell, or otherwise deal with gold in the United States or abroad" with an act of Congress codified in , which went into effect December 31, 1974. However, P. L. 93-373 did not repeal the Gold Repeal Joint Resolution, which banned any contracts that specified payment in a fixed amount of money as gold or a fixed amount of gold. That is, contracts remained unenforceable if they used gold monetarily, rather than as a commodity of trade. However, an Act enacted on Oct. 28, 1977, Pub. L. No. 95-147, § 4(c), 91 Stat. 1227, 1229 (originally codified at 31 U.S.C. § 463 note, recodified as amended at 31 U.S.C. § 5118(d)(2)) amended the 1933 Joint Resolution to make it clear that parties could again include so-called gold clauses in contracts made after 1977. Hoax of safe deposit box seizures According to a hoax, Roosevelt ordered all safe deposit boxes in the country seized and searched for gold by an official of the Internal Revenue Service. A typical example of the text of the alleged order reads: The first known reference to the hoax was in the book After the Crash: Life In the New Great Depression. The fake text refers only to gold, not to silver, which was added by 1998 to Internet references. It claims to be an executive order, but its text was written it to apply to specific individuals ("Your possession"), and so if the text originated from the government, it would have been sent to individuals, not published as an