A small portion of the business strike mintage of the Philadelphia coinage (including some of the mint set coins) and all proofs were struck with the type B reverse.
Also, the last year proofs would be minted until 1968.
This is the last year of regular-issue 90% silver coinage in the United States. Production exceeded 1 billion quarters for the first time. The proof set production of 4 million is also the highest to date and would not be exceeded until the Bicentennial issue of 1976.
Varieties: Doubled die reverse. (FS#25¢-024.5)
Mintage:
| Philadelphia | Denver |
| 560,390,585 | 704,135,528 |