1964-D missing RPM variety?

[thedrpepper]

Hi all, another puzzler for you. I found this 1964-D with what appears to be a RPM D/D. The MM does have that "machine doubling" step-like look to me, but there is absolutely no machine doubling anywhere else on the coin.

There are also a few very clear PUPs (to me anyway) on the obverse - a large die crack at the base of Washington's neck, and another at the top of his head.

What do you all think? Something I'm missing? Always appreciate your input. Thanks for looking!

[MintErrors]

In my opinion if it looks like machine doubling, it probably is.

Machine damage can show up anywhere and even just on a very small area (localized damage). The mintmarks back then were hammered into the working dies. That is one small little area. What is hammered into the die is raised on the coin. If the working die does not lift perfectly the mint mark could easily become damaged.

Variety vista does not have anything listed that looks like your coin.

http://varietyvista.com/09b%20WQ%20Vol%202/RPMs%201964-D.htm

[thedrpepper]

Thanks for the kind reply Gary,

I also didn't see anything like this on Variety Vista, so I had to post for the experts here!
I'm still a little unclear as to how machine doubling could occur on such a small localized area - can't wrap my head around it... Any resources you can point me to to read up more on this anomaly?

Many thanks

[occnumis2021]

Thanks for the kind reply Gary,

I also didn't see anything like this on Variety Vista, so I had to post for the experts here!
I'm still a little unclear as to how machine doubling could occur on such a small localized area - can't wrap my head around it... Any resources you can point me to to read up more on this anomaly?

Many thanks

for my part i don't have any specific links other than just some search engine searching. MD is a funny business but i will say that the 9 listed types of actual doubling is kinda of a hint here even thought the DD/RPM etc takes place at diff stages during minting than MD does but the rotation, pivoting, tilting, speed of production and the fact nothing on earth is perfect and in a constant sate of choas and entropy, inconsistenty, variables etc will unfortunately lead the way. MD is about perfect to fit right in the middle of all of this.

as much pressure as is applied by the mint machines and how loosey goosey they are as well as a collar which is moving allows for just infinite possibiltes of crap to happen. i mean i STILL don't understand how the machines with dies in them allow SOOO much movement (see o/c coins, MAD etc) without just breaking the machine and i've even watched youtube videos of actual presses getting moved around w/o breaking. it is beyond me i guess.

i too over the decades have thought just how inconsistent actual and machine doubling is, fwiw.

[MintErrors]

The easiest way I can explain it is, the working die has an image of the coin. This image is sunk into the working die. Later before use they hammer in the mint mark by hand with a hammer and a punch (up to 1989). That mint mark can be just a tad off position wise. It could be slightly at an angle.

When the working die is added to a press its done by humans. All there has to be is a very slight adjustment that is off. Or, a condition arises which causes that setting to be off for a split second.

The working dies come together, with the blank in the collar and squeeze the blank into a coin. As the dies separate, all it takes is a VERY small angle of lifting to shear off a touch of metal. That "D" is awful small cavity punched into that die.

We cannot always assume that this is the way it happened. It could have been something else. But I feel pretty confident that is a viable possibility.

For fun, lets assume it might have been another D. Looking at how strong the "hypothetical" D could be, I think you would see some separation of the mintmark else where, like split serifs or part of the "other" D in the center of that primary D.

[MintErrors]

As far as references, I would think https://error-ref.com would have some documentation on it. Its probably under the striking or machine doubling, ejection doubling or something similar.

Its tough to know what content in video is accuate.

There is a lot of info and videos that are not entirely correct out there, in my opinion.

[eaxtellcoin]

His photo is just a tadd out of focus also. When I blow it up MD does show in varing degree's on the Quarter, plus it looks as though the die is very worn / LDS. RPM_Coneca_Quarter.jpg