Unbelievable I think I have a 1970s small date I need help with this one. the r is hooked sharply across the seven. That's what I could find. Also the toning on these coins is unbelievable. Let me know what you think please on that small date 70s thank you for all your help.
The weak Liberty I think is on business strikes. Not proofs. The key to the small date is the curl of the 9. Yours is the large date.
The markers lead me to lean towards the large date. In addition, you have multiple threads mentioning Proof Mint Sets. That terminology is incorrect. The US Mint offers both Proof Sets and Mint Sets. Mint Sets are uncirculated coins, they are not proof strikes. So, you either have a Proof Set OR a Mint Set. It cannot be both.
