July 23 marks the 50th anniversary of the Coinage Act of 1965, which stripped U.S. coins of silver and made legal tender out of base metal slugs. It’s an anniversary that comes at an apt time, as Congress considers monetary reform.

This discussion has been quietly taking place in recent months, in the Senate Banking and House Financial Services committees. Rep. Kevin Brady (R., Texas), vice chairman of the Joint Economic Committee, recently reintroduced a proposal for a Centennial Monetary Commission as the Federal Reserve starts its second century.

The anniversary of the 1965 Coinage Act is a reminder of why reform is needed. Speaking from the White House Rose Garden, President Lyndon B. Johnson called the law he signed a “very rare and historic occasion.” It certainly was; it superseded the coinage act drafted by Alexander Hamilton and passed by Congress in 1792.

The original coinage act established the United States Mint and declared the dollar as the “money of account” for the new republic. It defined the dollar as 3711/4 grains of silver or the equivalent in gold; the penalty for debasing coins struck under the law was death.

When LBJ signed the 1965 act, the value of a dollar was almost exactly the same as it had been in 1792—0.77 ounces of silver. Despite some downs and ups, on average it had been remarkably steady for the long span.