Coinbuf

That cent looks like it was subjected to some kind of acid which reduced the weight.

This coin looks to have real promise for a DDO, as you noted there is no listing at VV.   I also checked Wexlers and do not see any listing for an 84-D on there.   I suggest that you post this on the CONECA forum for review, if they feel it has merit they will advise you on how to submit for review and as a possible new DDO.   Here is a link to the CONECA forum.  
Link

The shinny appearance makes me think its plated which could very well account for the weight. 

Always follow the money, and while I'm sure that CACG is expecting to be a profit center, I also think that JA does consider the collector in overall scheme of his operation, something that I am not sure I can say is true for large companies owned by wall street.   One of the reasons that JA has stated he wanted to start a CAC grading service was to cut some of the expense for average collectors.   Before CACG you had to send to TPG XYZ, then send to CAC stickering (assuming you want the sticker), CACG is meant to be a one stop shop where you can have your coins graded to the same standards as CAC stickering without the extra shipping costs and risk of loss.
I am not at all certain why you would choose to use a MAC sticker in the same breath as a CAC sticker, or even a Grif sticker.   MAC has no value in the marketplace except for the suckers that he finds on ebay that don't know any better and pay up for his inferior coins.   I know of no serious collector that would give weight or value to a MAC sticker.
And while you may not know any collectors who do, there are many collectors that will pass on very high grade and/or expensive coins (like your MS67+* DPL example) without a CAC sticker under the rational that such a coin must have already failed at CAC.   If you have a collection of any significant value, it is important to understand there are many collectors who value the holder and/or the sticker more than the coin, like it or not that is the reality of the current coin market especially true for coins in the grades of MS65 or higher.   As you move down in grades to lower MS and circulated grades a CAC sticker may be of less value but might result in a faster sale, which has a value in and of itself.
No one has to have an interest, but it is wise to understand that even if you have no interest and do not value a sticker or holder there are collectors that do.   And because there are many that do; having or not having the sticker can make a big value difference when you or your heirs sell.   You may not care now, but someday you might have a different perspective on this, or perhaps your heirs will wish that you had.
Something that many who poo-poo the CAC sticker don't realize is just how valuable that sticker can be in helping many collectors to not buy over graded and doctored coins; not everyone has the time or ability to become an expert grader.    Perhaps you know how to identify every single doctored coin in a straight graded TPG holder, but you would be a very rare individual as many, myself included, cannot every time.   The fact that there are coins with surface issues out in the marketplace is exactly why a second opinion has value.   If your doctor told you tomorrow that you were going to die in two weeks from some rare disease, would you just accept that as gospel or would you want a second confirming opinion.    I think that most would choose to have a second opinion before they start picking out a casket, CAC is that second opinion.

I would say that my experience is the polar opposite of yours when it comes to CAC.   Almost every CAC graded or stickered coin I have and the vast majority of those I have viewed are superior to a high percentage of those of the same grade in other brands or without stickers.    And so far, a high percentage of CAC stickered and graded coins have asking prices or realized auction prices that are in excess of standard guide prices.   Certainly, anyone can find a few examples of stickered or graded CAC coins that have not outperformed the guides but as an overall those are the outliers not the norm.
And I would say that most experienced collectors would indeed be (and are) willing to pay a premium for CAC graded and stickered coins, why do I think that, simple, those coins are so often superior to the vast majority of the usual tired and stale material in the market that continues to circulate between dealers and collectors.   Superior coins almost always bring strong prices, that is why CAC stickered coins have performed so well in the past and why CAC graded coins are doing well now.
Its the less educated, "bargain" buyers that are not willing to step up and pay for quality.

I'm sorry but your coin looks nothing like an as new mint state 1881-O Morgan dollar looks like.   Your coin has seen some circulation and/or mishandling in its past and would grade either low AU and possibly cleaned and is worth $30-$40 far less than the grading fees.   On the positive side by posting this before you attempted to have it graded you have saved yourself the fees and the anguish of getting the bad news on the grade later.

100% heat damage, there was another new member who posted with a very similar dime to yours, same diagnosis See this link.   Welcome to the forum.

Proofs are difficult to grade from photos, it is very easy to hide hairlines as Roger has shown in his post above.   My bet is that while the op's photos make it look undergraded, and in hand inspection would confirm that the grade is correct.

Very true and a good point.

The shinny appearance makes me think its plated which could very well account for the weight. 

Looks like a truck stop novelty type coin.   For sure was not made at the US mint and has no collector value.

1853 quarter eagle with repunched date, PCGS graded AU 53:


Photos courtesy of Stacks Bowers Galleries.

100% heat damage, there was another new member who posted with a very similar dime to yours, same diagnosis See this link.   Welcome to the forum.

...ur last sentence more accurate than u know...in some instances, liberty seated or bust issues the particular die pairing or varieties r unknown in unc, the $$$ differential between an au55 n an xf40 is commensurate with the diff between ms n au in other series....

Good points...the key thing is that the downgrade from MS to AU means big loss of registry points AND $$$.....the $$$ losses from AU-50 to EF-45 might not be as bad. 
Or it could, depending on the coin.

There is no way to make a determination based on those images. I will say that there seems to be some potential indicators that suggest the possibility of a DD but unless better images are provided I couldn't say with any certainty. 

Definitely plated. Even if plated with actual gold the platting is so thin that it adds almost zero value. 

This coin looks to have real promise for a DDO, as you noted there is no listing at VV.   I also checked Wexlers and do not see any listing for an 84-D on there.   I suggest that you post this on the CONECA forum for review, if they feel it has merit they will advise you on how to submit for review and as a possible new DDO.   Here is a link to the CONECA forum.  
Link

Tough to impossible to determine CAM or DCAM based on photos, too many ways to make the fields look dark and have the details stand out more in an image. You'd have to see a coin like this in person to truly make a determination.
Definitely a looker though. 

Yep, I've a whole jar of cents like this. What is different about yours?
Welcome to the forum.