Just Bob

Apparently, Ms. Doone has never had a real job - in other words, a job in the private sector. I can't say that this fact gives me high expectations concerning our coinage.
I may just be overly cynical when it comes to lifetime government employees, though. 

I am seeing what appears to be signs of the Blakesley effect opposite both clips, but I am certainly no expert on these errors.

May I suggest that those who thought this was hub doubling read this article by our hosts:
https://www.ngccoin.com/news/article/5688/Double-Dies-vs-Machine-Doubling

Greek tetradrachm Gela Sicily

Greek tetradrachm Gela Sicily

No. You could save it because it is kind of old and interesting, but it will probably never be worth more than the value of the copper it contains. 

You may want to copyright this. I foresee it becoming a very popular item in the future.

No U.S. coins minted from 1965-1967 had mint marks. They left the mint marks off to discourage hoarding, because the government was blaming collectors for the coin shortage. 
I suggest you buy a copy of "A Guidebook of United States Coins," by R.S. Yeoman, commonly called the "Red Book." It contains a wealth of information that is very helpful to a new collector.

I assume you are referring to the "teardrop" on the crossbar of the numeral "4" in the date, and other markers. Yes, these are present on the coins that have been labeled "Specimen" or "Special Mint Set." Here is the issue, though. These coins were labeled as being special, without any known documentation to back up the claim. They are all believed to have come from the same source, but there is nothing to prove that they were struck in a different manner than a normal coin. Numismatic author Roger Burdette (RWB who posted above) believes that these coins are nothing more than the first coins minted from new dies, and this is what gives them their sharply struck, satiny appearance, often with numerous die polishing lines evident.  This is also the explanation given by NGC. 
If, in fact, these "Specimen" coins are actually  normal business strikes, it is entirely possible for there to be coins found in circulation, or in mint sets, with these markers. It is unlikely, however that the same markers would be present on a proof coin. Since all three of your coins appear to be proof coins, I would be interested in seeing closer pictures of these markers that you see.

If I spotted a coin shop selling damaged Lincoln cents for$1.50, I would never darken the doors of that establishment again.

If I spotted a coin shop selling damaged Lincoln cents for$1.50, I would never darken the doors of that establishment again.

I assume you are referring to the "teardrop" on the crossbar of the numeral "4" in the date, and other markers. Yes, these are present on the coins that have been labeled "Specimen" or "Special Mint Set." Here is the issue, though. These coins were labeled as being special, without any known documentation to back up the claim. They are all believed to have come from the same source, but there is nothing to prove that they were struck in a different manner than a normal coin. Numismatic author Roger Burdette (RWB who posted above) believes that these coins are nothing more than the first coins minted from new dies, and this is what gives them their sharply struck, satiny appearance, often with numerous die polishing lines evident.  This is also the explanation given by NGC. 
If, in fact, these "Specimen" coins are actually  normal business strikes, it is entirely possible for there to be coins found in circulation, or in mint sets, with these markers. It is unlikely, however that the same markers would be present on a proof coin. Since all three of your coins appear to be proof coins, I would be interested in seeing closer pictures of these markers that you see.

I'm glad someone else saw that. I thought it was my eyes.

May I suggest that those who thought this was hub doubling read this article by our hosts:
https://www.ngccoin.com/news/article/5688/Double-Dies-vs-Machine-Doubling

At this point the master hub was also getting worn. In fact, a new master hub was created the following year, if my memory serves me correctly.

May I suggest that those who thought this was hub doubling read this article by our hosts:
https://www.ngccoin.com/news/article/5688/Double-Dies-vs-Machine-Doubling

Mercari - home of many sellers of counterfeit coins, and many extremely overpriced genuine coins. Almost as bad as Etsy.

OP, the post above mine is by the man who wrote the book on Peace dollars. And, I mean that literally - the name at the bottom of the book pictured below is his. If he says a Peace dollar is fake, I see no need to pursue the matter further.
 
 

I am of the opinion that this coin is not genuine.

Not quite. It was not the quality of the dies. The high relief of the design resulted in inadequate metal flow, causing the higher areas of the coin, such as the hair over Liberty's ears and the eagle's breast feathers, to not strike up fully with a single strike, at least on most coins. This was resolved by lowering the relief on the coins dated 1922 and later.

OP, the post above mine is by the man who wrote the book on Peace dollars. And, I mean that literally - the name at the bottom of the book pictured below is his. If he says a Peace dollar is fake, I see no need to pursue the matter further.
 
 

I am of the opinion that this coin is not genuine.

May I suggest that those who thought this was hub doubling read this article by our hosts:
https://www.ngccoin.com/news/article/5688/Double-Dies-vs-Machine-Doubling

I am of the opinion that this coin is not genuine.

I am of the opinion that this coin is not genuine.