Greenstang

Great find, this is the third one that I have seen posted.
Definitly an error, as stated, retained cud with a bi-level die crack.
Where did you get it?
Almost forgot
Welcome to the forum and great closeup pictures.

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.

Coinbuf beat me to it but I was just going to say the same thing, counterfeit.
Besides having that cast look, the reverse is wrong. There are two types of    
reverses on Trade Dollars and that is neither one of them. Looks like a    
combination of both types.
 If you bought it, hope that you did not pay too much.

And how many “Newbies” do you expect to read this. Most of them don’t even read the top two pinned
threads on posting and basic resources

Quite the Die Crack. Almost runs rim to rim.

It is a “D” mintmark with a broken post that has been damaged.      
Nothing of any extra value.
Nice closeup photo, just what we need to see all the details.

Welcome to the Chat Board
As stated, an occulated gas bubble can only occur on a solid alloy coin, mostly on Lincoln Cents.   
What you have is caused by heat and have the nickname Campfire Coins.   
We see these quit often on the various coin forums so they are not unusual.

Certainly not a mint error. It looks like it has glue on it as you can see through it.   
 Try soaking in acetone for about 24 hours and see if it comes off.

Certainly not a mint error. It looks like it has glue on it as you can see through it.   
 Try soaking in acetone for about 24 hours and see if it comes off.

And how many “Newbies” do you expect to read this. Most of them don’t even read the top two pinned
threads on posting and basic resources

Welcome to the Chat Board

It is what is called a partial grease filled die, a minor error. Not uncommon and adds little or no value.

Instead of five photos of the obverse, please show one of the reverse.

Good luck then, I hope it is genuine. It would be nice to have a genuine coin found after all of the
counterfeits we see on the forum. Please do give us the results either way for our own education.

Don’t know how a coin can be “slightly “ broadstruck, it either is or isn’t.   
I see nothing unusual about the OP’s dime. Die wear and circulation wear
can make minor changes to appearances. 

Good luck then, I hope it is genuine. It would be nice to have a genuine coin found after all of the
counterfeits we see on the forum. Please do give us the results either way for our own education.

This is the forum for registered sets, you should have posted this in the newbie forum.   
Have asked that it be moved to the appropriate forum.

Why would you want to clean a top pop? You could ruin by trying to clean it.      
Not only that, you would have to remove from its holder and pay to get it regraded.   
Also NCS does not clean coins, they conserve them, a big difference.

Welcome to the forum
As stated, just a stained cent, sometimes called coffee cup coins.   
If you are going to get into the error world of coins, suggest you do some studying on what constitutes.  
a real error and also study on how coins are minted. This will save you a lot of time road. Also you should.  
be able to distinguish between a variety and an error, they are too different things. Remember, it is only an.  
error if it happens during the striking of the coin, anything that happens after that is considered damage.   
Suggest reading some of the websites that EagieRJO has provided under “Basic Resources & Glossary”.  
at the top of this page. Also get yourself a Redbook for general references.

And how many “Newbies” do you expect to read this. Most of them don’t even read the top two pinned
threads on posting and basic resources

Can’t be repunched, they stopped hand punching dies in 1989.
Looks like Machine Doubling.

Can’t be repunched, they stopped hand punching dies in 1989.
Looks like Machine Doubling.

There is nothing on that dime that can’t be attributed to damage.
Even if there was an error, in that condition there would be no premium.  
Not sure what research you are doing, are you checking out sites such as  error-ref.com.  
to see what real errors look like. 

There is nothing on that dime that can’t be attributed to damage.
Even if there was an error, in that condition there would be no premium.  
Not sure what research you are doing, are you checking out sites such as  error-ref.com.  
to see what real errors look like. 

Nice cent but unless you think it is worth more than $150.00, it would not be worth the cost of grading.

They are nicknamed “Campfire Coins”.   
We see these fairly often on this site.
 

They both look normal to me. One has just toned more than the other from circulation.   
pleas3 be specific with your question, what is it your seeing?