Are there any known 1971 40% silver halves known?

why the 1974 D?

the 1971 makes sense: leftover planchets from 1970, and the 1977, left over from the special bi-centennial editions.

but, 1974?

 

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The 1974's were also struck in 1975 and that was when ALL of the silver bicentennial coins were struck.

 

Could it be possible that there are 1965 90% silver halves? 1965 silver dimes got created as the mint was still striking silver coins till '66 under the date 1964. A couple of blanks went to the wrong die and got 1965/66. Rumours exist of a 1967 silver dime, as 1966 was the last year for silver dimes. They were dated 1964. In 1970, only proofs were minted. Only a veeeeeeery lucky blank would be going to 1971.:hatch:

 

Yes it might be possible. In 1965 the Denver mint struck both 90% and 40% silver halves.