This was partly to discourage the hoarding of coins during this time of transition, but the D (Denver) and S (San Francisco) mintmarks eventually were used again in 1968. Coins dated 1965, 19 were intentionally produced without a mintmark.
In the mid-1960s, the United States was in the midst of a nationwide coin shortage due to a major shift from striking 90% silver coins to those of a less-valuable “clad” composition. Why There Are No Mint Marks on Coins Dated 1965, 1966, and 1967? No S Proof coins are known from 1968 (Roosevelt Dime), 1970 (Roosevelt Dime), 1971 (Jefferson Nickel), 1975 (Roosevelt Dime), 1983 (Roosevelt Dime), and 1990 (Lincoln Cent). A few sets from selected years were accidentally released to the public without the intended S mintmark, however, and are known today as “No S Proofs.”
Starting in 1968, the proof coins in these sets were supposed to be minted with an “S” mintmark for San Francisco, the US Mint facility that produces these pieces. Such coins were never released into circulation and typically cannot be found in change as a result. They were housed in hard plastic cases, often with a decorative outer box, and had brightly mirrored surfaces.
Proof coins, or special strikes intended for collectors rather than circulation, have been issued in 5-coin proof sets each year for decades. Specifically, the No S Proof coins that were mistakenly released by the San Francisco Mint. PREVIEW – Check the schedule to find the next rare coin auction. However, a coin with no mintmark can be special when this mintmark was left off by accident rather than on purpose. This is normal and rarely adds value given the large mintages at this important coin-minting facility. Millions and millions of coins have been struck over the years at the Philadelphia Mint with no mintmarks. One of the most common questions that we are asked is about coins without mintmarks or that seem to be missing a mintmark. Coins - Collecting Guide by Sarah Miller What are Coins with No Mint Marks, and Are They Valuable? 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.U.S. Furthermore, this unprecedented attention will surely create some copycat coins. However, finding the exact same 1970S over 1941 Canadian quarter almost surely isn’t going to happen. I think the exciting idea is that this same person could have put a number of other coins through the same process and that other similar type errors could still be out there. And by that we mean that it is very likely that someone intentionally put this 1941 Canadian quarter into the machine knowing that it would create an error. So it isn’t so much a process error in the production as much as it is a one of kind manmade error. The proof 1970-S quarter is struck over a 1941 Canadian quarter. The current hysteria around the 1970-S quarter relates to one that was discovered by and is currently be marketed by a well known coin dealer who specializes in mint errors.
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