Greenstang

Early gold coins are among the most counterfeited of US coins.     
Going back to about 1853, gold coins hold 43 out of 50 top positions of the most counterfeited coins.

Just guessing here but it could possibly be an assayers mark verifying that it is gold.  
much like the trade dollars that were counterstamped proving them to be genuine.

I usually just go by the distance between the 2 and the border.   
If you can fit another letter between the space it is a Small Date.   
If it is closer to the border it is a Large Date.   
This way if the numbers are worn or damaged, you can still tell the difference.

I usually just go by the distance between the 2 and the border.   
If you can fit another letter between the space it is a Small Date.   
If it is closer to the border it is a Large Date.   
This way if the numbers are worn or damaged, you can still tell the difference.

Don’t know why all the photos are upside down but that looks more  like Die Deterioration Doubling.  
Certainly not a Doubled Die.
Note:
The correct terminology is Doubled Die

Easy way to tell.   
If the zero is round, it is a Large Date, if it is oval, it is a Small Date.   
All yours are round so they are Large  Dates.

They were all like that in 1978  . When comparing coins, make sure you compare with the same year as ther can be small variations from year to year.

Welcome to the forum
Even if it was a “over mint mark” which it can’t be, it would be a variety, not an error, big difference.

It can’t be a DDO as the mint marks were hand punched until about 1989.
It also looks like it has been plated which would make it ineligable to be graded.

“How do you know its a fake my friend”
Years of experience and knowing what to look for.   
All you have to do is compare your coins to the original photos posted above.   
Not sure where you got them but do you really think that you have two coins,   
one worth 6 figures and the other worth 4 or 5?

Just go by the distance from the rim to the two. Small space = Large  Date.

Die Deterioration Doubling does not add any value to the dime.   
It is one of the worthless types of doubling.

This is the forum for buying/selling coins, I have asked that it be moved.
It looks like a copy, it is too round and has rims which ancient coins don’t have.

It can’t be a DDO as the mint marks were hand punched until about 1989.
It also looks like it has been plated which would make it ineligable to be graded.

“How do you know its a fake my friend”
Years of experience and knowing what to look for.   
All you have to do is compare your coins to the original photos posted above.   
Not sure where you got them but do you really think that you have two coins,   
one worth 6 figures and the other worth 4 or 5?

Welcome to the forum
Sorry but both of those coins are counterfeit and neither NGC or PCGS will grade counterfeit coins.  
There is no numismatic value to either one.

Don’t really see any errors, a DoubledDie is a variety, not an error.   
If you have to increase the size that much to see something, it would be irrelevant anyway.  
as grading companies only use 5X magnification. You could probably find something wrong
with any coin increasing the size that much.

Even if it passes the magnet test and is the right weight, it is still a counterfeit.   
All you have to do is look at the position of the S mint mark, it is in the wrong position.

“How do you know its a fake my friend”
Years of experience and knowing what to look for.   
All you have to do is compare your coins to the original photos posted above.   
Not sure where you got them but do you really think that you have two coins,   
one worth 6 figures and the other worth 4 or 5?

Welcome to the forum
Sorry but both of those coins are counterfeit and neither NGC or PCGS will grade counterfeit coins.  
There is no numismatic value to either one.

Welcome to the forum
Sorry but both of those coins are counterfeit and neither NGC or PCGS will grade counterfeit coins.  
There is no numismatic value to either one.

Toneing is not an error Toning can be many colours depending on the environment it was exposed to.
 

If you are referring to the NGC registry, then yes, they have to be graded by either NGC or PCGS
otherwise how would they know what grade to register them.

Two types of 1942 Canadian Nickels
The first half of 1942 produced the regular 100% nickel 5 cent coins. Part way through in order to preserve nickel for the war effort, they switched to Tombac (a form of brass).  The twelve sides was to avoid confusion with copper cents. Tombac 5 cent coins were produced in 1942 and 1943.

Welcome to the forum
Damage is not an error, what you have is worth 1 cent.   
Study up on how coins are minted and what constitutes an error or a variety. 
These are just some of the good sites
error-ref.com
Lincoln cent resources
Wexler
Doubleddie.com