Buffalo Experts Needed 1927-S RPM or Over Mint Mark?new image added

This is the mint mark from my 1927-S buffalo nickel. I can see another mintmark under the S but am not sure if it is another s that is reverse or inverted or could it be a D? I need help on this one as I have not found much information on this date and mint mark with these issues.





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CPG/Variety Vista/CONECA have not documented one either.
Doesn't mean it doesn't exist though.
Looking for Top Pop Mercury Dime Varieties & High Grade Mercury Dime Toners.
Leo
The more qualities observed in a coin, the more desirable that coin becomes!
My Jefferson Nickel Collection
<< <i>Locating a mint state example will confirm your findings.
Leo >>
This is a high AU low ms coin and I will get some more images as it is not a die chip.
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<< <i>Sounds like you may have a "discovery" variety...those are the BEST...I am working on one myself...different denomination though. >>
This is of course the hope. Who should I send it to?
<< <i>Probably just a badly eroded die. San Francisco did a terrible job of hardening dies in the mid-20's. >>
^^This^^^
I am really sick right now but I will try to get better images as I just quickly used my dinolite microscope. I have seen many abraded dies, worn dies, die chips etc and in hand this does not look like any of those. I have seen many Over mint marks and repunched Mint marks and that is what it looks like. What I really need is a second in hand review of the coin. Does anyone hgave any suggestions who I can send it to. Would Wexler be a good idea?
BST transactions: dbldie55, jayPem, 78saen, UltraHighRelief, nibanny, liefgold, FallGuy, lkeigwin, mbogoman, Sandman70gt, keets, joeykoins, ianrussell (@GC), EagleEye, ThePennyLady, GRANDAM, Ilikecolor, Gluggo, okiedude, Voyageur, LJenkins11, fastfreddie, ms70, pursuitofliberty, ZoidMeister,Coin Finder, GotTheBug, edwardjulio, Coinnmore, Nickpatton, Namvet69,...