The majority of proof coins are still in these original black cases. Yes, it is possible that someone broke the coins out of cases and spent them. But most loose quarters dated as 1970 will be circulation coins with no mintmark or the D mint mark. Step1: Do You Have A Proof 1970-S Quarter?
What was the first matte proof nickel ever made?
The extraordinary sharp strike on this matte proof 1964 SMS Jefferson nickel is even more impressive than typical proof coins. It was part of a prototype Special Mint Set that was never released. This was the first frosted matte finish coin issued in the Jefferson series.
How much is a 1970 Mint error worth?
The significant value of the mint error is going to be great incentive for people to buy regular proof 1970-S quarters for $1 and try to alter the coins to give them the look of a true mint error. The coin on the left is a standard 1970-S quarter that has a value of about $1.
