From 1965-1967 the US Mint offered Special Mint Sets in lieu of regular Proof or Mint sets. These were issued in special hard blue cases and struck in San Francisco, however the coins have no mint mark. A few coins dated 1964 exist but no official sets were offered.
| coinage-type | Special Mint Set |
| desg | SP |
| mintage | 1,863,344 |
| pcgs-link | 904520 |
| pcgs-number | 904520 |
| variety | Special Mint Set |
| year-display | 1965-1967 |