The chart below enables you to see how the 1921-D Walking Liberty half dollar (in EF-40 grade) stacks up against the Collectors Rare Coin Index (abbreviated as CRCI).
The blue line represents the percentage increases/decreases of the 1921-D Walking Liberty half dollar. The red line is the percent fluctuations of the CRCI, calculated by the cumulative activity of all 100 coins tracked in the Index.
The percent scale on the left-hand side of the chart pertains to the blue and red lines. Both lines start in January 1990 at 100.00%.
For any of the 100 charted coins, compare its blue line to the red line to understand how it performed relative to the Index as a whole.
The $ dollar scale on the right-hand side makes it possible to study retail price variations of the 1921-D Walking Liberty half dollar over the same time period, as indicated by the gold color.
Interested in buying an example of the 1921-D Walking Liberty half dollar? For your convenience, the eBay** preview directly below MAY show examples of this coin currently for sale, but THIS LINK does a more thorough search.
Hover over the chart to review the data in greater detail.