It is kinda hard to believe people would still think dollars are backed by gold but then again fiat currencies are a relatively new "invention". The Federal Reserve Act lead to the creation of fiat currency in 1913 but National Money still existed along side it in various forums until 1968.
Maybe he saw a really old dollar like this one and assumed the promise was still valid.
Or maybe one of the various silver notes issued over the years. However even if you find these notes today the promise of redemption has been rescinded (US notes in 1953 and silver notes in 1968).
These notes were the last national currency of the United States, issued by an independent treasury, outside the control of any bank, and backed by precious metal. I will say that again since it seems to be something that a lot of people simply don't get.
The United States has not had a national currency since 1968 (and the begining of the end was in 1913). While FRNs may say "US Dollars" the Federal Reserve is a private cartel of corporations, and the private script they issue is as "federal" as Federal Express. If you deposit any of this "legacy" national currency at your local bank it will be replaced with FRNs and the notes sent to Treasury for destruction*. Why? Well banks don't like competition and they fought very hard for nearly two centuries (with lots of setbacks) to eliminate national currency in this country. Federal reserve notes are a currency
in use in the United States, they are even accepted as legal tender in the United States but they are
not money of the United States.
If you didn't know this already likely right not your first thought it "no that can't be right". I would say the majority of Americans don't even realize there is a fundamental difference between the two notes. The United States Notes (and other forms of national currency issued by the treasury like silver certs) were a
bill of credit. Each note being backed by reserves of precious metals (either silver or gold) in US Treasury vaults. In essence if you had a US note (prior to close of redemption) the US government OWED YOU the holder some value. This made it was exactly like buying and selling in physical bullion except more convenient. Federal reserve notes on the other hand are issued by debt. They are issued by the Federal Reserve and the interest becomes a perpetual obligation of the United States. Holding a federal reserve note doesn't mean the federal reserve owes you anything. On the contrary the very fact that you have a federal reserve note in your hand is proof the government is in debt to its bankers. If the US government had no debt there would be no federal reserve notes.
As disgusting as the bait and switch is, I have to give credit where credit is due, the transition (which took decades) was an awesomely well played. It finally (by 1968) gave a private cartel of bankers something they schemed to acquire for nearly two centuries ...
complete and absolute control over the money on the United States.
Give me control of a nations money supply, and I care not who makes it’s laws.
* A little bit of sad trivia. Since US notes were originally issued by the US government they were a liability of the treasury however the Treasury wasn't in debt because for each issued note it held an equal amount of precious metals (assets) thus the net liability on the Treasury was zero ($1 printed = $1 of gold/silver in reserve). However when the reserve was removed and sold off, the notes remained (thus $1 note = $1 liability with no matching reserve to offset it). This means the United States treasury acquired a debt equal to the amount of outstanding notes. By outstanding notes we only mean actual "legacy" national currency. FRNs aren't issued by the Treasury (they are bought by the treasury for debt). While US notes can no longer be redeemed for gold they can be redeemed for FRNs. Banks will do this as part of the normal business. They seperate the US notes from THEIR federal reserve notes and then ship them up to the federal reserve banks. The federal reserve then sells these notes to the Treasury for more debt in FRNs. Slowly overtime as the bills come out of circulation the debt by the Treasury to the holders of the currency is reduced but it is replaced by an equivalent amount of debt owed to the federal reserve.