1964 quarter

[TVejr]

What caused this? 35138EDC-09DF-4280-BC99-2EB5C9A72184.jpeg

[occnumis2021]

it is actually an odd process if you ask me. we get variations of the dies bouncing, rattling, moving and coins being "damaged" during ejection (even during being put into and transporting if large containers/ballistic bags or whatever) causing a very similar effect and probably some other things i'm not thinking of and/or don't know that causes metal to be pushed/smooshed in various directions leading to essentially mass confusion about ddo/ddr/rpm etc BUT 99% of the time the trained eye can discern the difference, even in situations where the effect is minor but sometimes can be challenging and even sometimes the pros don't agree.

in your situation, i am confident all the pros would agree this is not an RPM even if they disagree on how the smashed metal occurred.

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[TVejr]

Thanks for the information. It’s one of my favorite mystery coins. Perhaps it might be Flat Field Doubling.

[MintErrors]

In my opinion, it could simply have been an effect from the punch itself. It could have been the metal base of the punch. The mint worker smacked the working die pretty hard, and the mintmark punch actually sunk deep into the working die, bottoming out....leaving an impression of the outer metal lower outer metal area of that punch. It could be what occ said as well. Tough to know for sure.

[occnumis2021]

In my opinion, it could simply have been an effect from the punch itself. It could have been the metal base of the punch. The mint worker smacked the working die pretty hard, and the mintmark punch actually sunk deep into the working die, bottoming out....leaving an impression of the outer metal lower outer metal area of that punch. It could be what occ said as well. Tough to know for sure.

i agree about sometimes the punches can create anomalies. if you look at some MM, you can dee a depression around the mm. i first noticed this on 09-S vdb long ago and then started seeing it on some other denoms.

this one does appear to deviate from the standard machine doubling, so another explanation could be spot-on.

though, i will say, it is for sure not a RPM effect.

i now wonder how many coins could have the RPM obliterated only to be confirmable by placement and secondary pups? gotta happen sometimes.

[MintErrors]

i agree about sometimes the punches can create anomalies. if you look at some MM, you can dee a depression around the mm. i first noticed this on 09-S vdb long ago and then started seeing it on some other denoms.

this one does appear to deviate from the standard machine doubling, so another explanation could be spot-on.

though, i will say, it is for sure not a RPM effect.

i now wonder how many coins could have the RPM obliterated only to be confirmable by placement and secondary pups? gotta happen sometimes.

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I have seen some cases of pups and mint mark placemt that was close, with coins, especially cents where the mintmark simply did not look like an RPM at all. Some rolls I could separate the roll by looking at just a few pups on the obverse.

I wonder some times whether mint workers during die maintenance grabbed a die punch during die maintenance and added another mintmark, whether detectable or not.

I've seen some pretty noticeable craters around mint marks. The worker could have had an extremely strong grip and hit that punch into the die several times, and all being accurate, no one detects the multiple hits, since they are so precise.