As others have mentioned, they are neither uncirculated sets nor proof sets.
Per the Mint in a 1968 Press Release about the return of mint marks:
Proof coin sets, which consist of a specially made half dollar, quarter, dime, nickel and cent, have not been produced since 1964. Their production was discontinued at the end of that year so that full production facilities would be given over to making regular issue coinage to alleviate the existing coin shortage.
Beginning late in 1965, however, conditions permitted the production of special mint sets at the San Francisco Assay Office. Although these sets are better in quality than any of the regular uncirculated coin sets previously packaged by the Mint, they are not of proof quality.
Collecting history one coin or medal at a time! (c) commems. All rights reserved.