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Message:: [QUOTE="KBBPLL, post: 25593918, member: 104064"]It's worth reading the item description on GC as well as the Coin World article included with the auction. I think it is probably the article from January 1978, although the publication info is not in the clipping (it doesn't look like it's from 2011 when another article was published). Not mentioned in the PCGS blurb on these is that SF also struck almost 72 million circulation dimes in 1975 without mint marks. So in addition to the possibility that Philly shipped a proof die and neglected to punch the mint mark, SF could also have mistakenly "proofed up" a die intended for the circulation strikes. In that respect, it's possible that someone at SF intentionally "proofed up" a circulation die without someone in Philly being in on it. I still don't think that's likely. It's interesting how all the "no mint mark" nonsense originated from these. The article calls them "S-less" and "sans-S", and the TPGs currently call them "No S." Nobody called them "no mint mark" until the get rich from pocket change charlatans got involved. [ATTACH=full]1638344[/ATTACH][/QUOTE]