Question for Liberty Seated Dime experts 1891 O

I checked Gerry Fortins site couldn’t find this one. Looks like lots of clash and overstruck mintmark . What could this be?
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I checked Gerry Fortins site couldn’t find this one. Looks like lots of clash and overstruck mintmark . What could this be?
Comments
I believe clashes are part of a die state, rather than die variety, which is why you might not see it listed.
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Gerry includes clashes in his listed die varieties - 102a, 103a, ... 132a.
https://www.seateddimevarieties.com/date_mintmark/1891ovarpage.htm
The clashing on this coin looks a lot like F-128.
But many clash patterns are similar, and I did not check the date or mint mark position.
Thanks guys, The notch on the mintmark is what confounds me. It is reminiscent of a O/S type but none exists for this year in seated dimes. Any thoughts on what could have caused this?
If it truly is an over-mintmark, then it would have to be either an O or an S, as there were no other mintmark punches used on dimes in the time period of 1879 to 1905. Thus it would have to be an S because of the “straight” serif type die mark.
However I am led to believe that it might be a result of the clashing, and is probably a clash mark from Liberty’s head.
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Thanks I learned a lot. It could be heavy clash from the head. It oriented right. I will look for other examples.
Not an 'O' over 'S.' The notch could be an indication of the die starting to break or crack.
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I have a couple of 91o’s they all have various clashes, cuds or heavy die breaks except for my UNC.
Always considered the issues interesting after the pause since 1860 right before the war but they weren’t well made as they were still figuring out small coins

Here is the UNC in an OGH
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I think the spur on the mint mark is the result of a scrape that pushed metal into that position.