It's one of the key scarcities of the series in recent decades. Just 950,473 were issued in 1997, the lowest output for U.S. mint sets in the span 1964-2003, encompassing 40 years of issue. The set includes specially minted Brilliant Uncirculated specimens of all U.S. circulation coin issues for the date: both Philadelphia (P mintmark) and Denver (D) cents, nickels, dimes, quarters and half dollars. Protective see-through enclosures also include issuing mints' medals. It was a year when a strong U.S. economy and potent dollar led to federal surpluses for the first time in a long while.