1971 no mint mark could this be a proof

Ok ty

 

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Hence my initial reply. There is a need to educate, not just using blanket statements, like that all proofs have an S mint mark. That’s only true since 1968, and for cents not until 1975.

 

oh, yeah... educate... what a novel idea

 

are there san franciso minted cents in mint sets for those years

 

yes, San Francisco minted business strikes as well as all of the proofs in 1971