That new photo makes it easier.
Definitely a split planchet.
Don't think I have ever seen a split that large.
Nice find.

The Churchill Commemorative is from Great Britain and is a a legal tender 5 shilling coin.
Value like any other coin depends on condition.
If circulated, not much over face value.
In MS condition, maybe $10.00 if you can find a buyer.

Sounds like you have some nice coins to dispose of
It would help if we knew where you are located.

Need a picture.

If you are going to display them, they would probably look better filled.
It won't increase the value though as they would still be damaged coins.

Going to need more info.
You don't state what year the bill is or how it was cut incorrectly.
There are many bills that were modified to look like an error.
Will need a picture before being able to say if it is a true
error or not.

I don't think I would bother getting them graded. It would probably cost more than they are worth as they are well worn and creased. Hard to grade bills from a picture, but they might make VG. Look to see if you have a series A. They are worth 4 or 5 times as much as the other series. Still nice to ...

As Bill stated
Post mint damage.
It was done after it left the mint.

I agree.
Not a diecap but PMD.

Sorry meant OT4
Hit the 5 buy mistake.

OT5

It doesn't reall y matter how it was done. There are a lot enterprising people out
there that do many strange things to coins.
The main thing is that, as shylo stated and I agree, it couldn't have been done at
the Mint so that makes the coin PMD.

I take it that all the coins are nickel coloured and that is lighting
that causes two of them to look gold?
Also, what is the significance of the third coin on the picture of the Obverses.
It looks too be the same size as the centre coin.
Just trying to eliminate possibilities.

Thanks

There is one listed on eBay from Gatewest Coins for $27.00
Their prices are usually pretty fair.

A wrong planchet was my first thought too but then I realised the OP said that it was larger than a regular Nickel. This eliminates a wrong planchet because it would have to be smaller or same size as a regular size Nickel planchet or it would not fit in the collar. Guess we will have to wait for ph...