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Message:: [QUOTE="KBBPLL, post: 25584538, member: 104064"]That's the theory. From the same PCGS blurb: "The extreme rarity of the 1975 "No-S" Proof Dime can be explained in two ways (both plausible conjectures): 1. The error was discovered at the Mint in time to stop the press, but not before a very small quantity of sets had already gone out the door. 2. The coins were deliberately made. This explanation is not as far-fetched as it may seem, because other remarkable Proof errors emerged from the San Francisco Mint during the early 1970's (for example, a Proof 1970-S Washington Quarter struck over a 1900 Barber Quarter -- from Philadelphia)!" Seems like in 1975 they caught it sooner than the other years, so there are fewer examples. Why it happened multiple times over the course of many years, who knows. I don't buy theory #2 - mint sport - because it would have to be coordinated between someone in Philadelphia who deliberately didn't punch the mint mark and then someone in SF who coined them. I suppose someone in Philly might have deliberately done it for giggles and SF didn't notice it, but it seems more likely that it was just sloppy QC at both mints.[/QUOTE]