In an effort to formalize and document what has long been known to industry insiders and involved collectors, PCGS has constructed an index of the ten most significant U.S. rarities, and tracked their prices from both public auctions and private sales (where known) over the past 44 years. The results confirmed that an investment in almost any one of these notable numismatic icons would have proven to be fortuitous.
The quantity known for each of these coins in the Index lies between five and twenty pieces, so three quality levels for each coin were tracked. With ten coins in three quality grades each, thirty individual pieces were measured, and the resulting Ultra-Rarity Index is the average of those thirty pieces. Prices were taken from auction results and private sales.
All coins were indexed to 1000 as of January, 1970 and by October 2013, the composite index stood at 63,271.9, or an increase of just over sixty-three times (6300%).
For an in-depth look at the PCGS Ultra-Rarity Index, including the ten coins that make up the index and a historical price review of each, download the full color brochure below.