Proof Kennedy half dollar rolls are calculated based on the PR64 singles Greysheet bid price.
| coinage-type | Kennedy half dollars |
| desg | PR |
| designer | Gilroy Roberts & Frank Gasparro |
| diameter | 30.6 |
| edge | Reeded |
| fineness | 0.4 |
| material | 40% silver; 60% copper |
| mint-mark | S |
| obverse-description | Portrait of President John F. Kennedy surrounded by the word LIBERTY on the periphery. IN GOD WE TRUST appears left and right of the portrait with the date at the bottom. The mint mark appears under the right of Kennedy's neck. |
| reverse-description | The heraldic eagle holding arrows and branch of olive leaves with a full circle of stars around it. UNITED STATES OF AMERICA * HALF DOLLAR surround the periphery. |
| variety | 20 Coins |
| weight-grams | 11.5 |
| weight-ounces | 0.36169 |
| year-display | 1964- |